Optical Telescopes Part I

The beginning of modern astronomy is often linked to Galileo building his first telescope in 1609 — roughly 400 years ago! While he was not the first person to use a telescope, Galileo made many fascinating discoveries, ultimately revealing that the Earth orbits the sun.

This video showcases the Zenith Telescope, built by Troughton & Simms in London, England circa 1872. Surveyors used this telescope to mark the boundary between Canada and the United States along the 49th parallel in western Canada.

To learn more about telescopes, visit the Canada Science and Technology Museum.


Duration : 0:2:25

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How to Buy a Telescope : Telescope Buying Guide: Dobsonian Mounts

Dobsonian telescope mounts are commonly used for reflecting telescopes or Newtonian telescopes. Learn about Dobsonian mounts for telescopes in this free video on home astronomy from a telescope salesperson.

Expert: Jesse Sturgeon
Bio: Jesse Sturgeon has served as a sales and customer service representative for Anacortes Telescope in Anacortes, Wash. for several years. He enjoys introducing people to the science & art of astronomy.
Filmmaker: Curtis Enlow

Duration : 0:2:24

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How much are telescopes and how good quality?

I was just wondering about telescopes whats the cheapest you can get one that actually works? And how much can you get one for, that you can see the moon and planets with in quite good detail?
I’m only sixteen so anything over £100 is going to be too much, is it worth it? 😛

The best deal in telescopes is the Dobsonian design, such as these:

With telescopes, you very much get what you pay for. A £100 telescope will be extremely limited in what it will show you, and you will soon be frustrated and wanting more. Most of the telescopes in this price range are cheaply made toys…the ones on the page above are some of the rare exceptions. Quite frankly I wouldn’t recommend any of the competition. Read some of the recent telescope questions here and you’ll see how frustrating cheap telescopes can be! Anything less than a 150-mm Dobsonian is probably a waste of money, so realistically you’re looking at around £200.

Here are a few web pages with good information on beginner’s telescopes:

For more advanced information, read Phil Harrington’s Star Ware, 4th edition (Wiley).

You’ll get the greatest value for your money with a Newtonian reflector on a Dobsonian mount, such as these:

Buy from a store which specializes in telescopes and astronomy, either locally or online; don’t buy from department stores, discount stores or eBay as mostly what they sell is junk. Find your local astronomy club and try out different telescopes at one of their star parties:

I strongly recommend that beginners steer clear of astrophotography until they have learned their way around the sky. Astrophotography is by far the most expensive and difficult area of amateur astronomy.

Many people who buy telescopes have no idea how to find interesting things to observe. A good introduction to finding things is NightWatch by Terence Dickinson (Firefly). A more advanced book is Star Watch by Phil Harrington (Wiley).

How to Use Telescopes : Planetarium Software & Telescope Viewing

Planetarium software for telescope users and lay astronomers help viewers explore the sky. Learn about planetarium programs that help local telescope viewers from an observatory director in this free astronomy video.

Expert: Rocky Alvey & Billy Teets
Bio: Rocky Alvey is the assistant director of the Vanderbilt Dyer Observatory and has been involved in astronomy since 1969.
Filmmaker: Dimitri LaBarge

Duration : 0:2:36

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Why are telescopes that detect different types of electromagnetic waves used to observe the universe?

Satellites fitter with various telescopes orbit the earth. These telescopes detect different types of electromagnetic radiation.

Why are telescopes that detect different types of electromagnetic waves used to observe the universe?

First, electromagnetic waves span a spectrum. It is a chart-like-scale humans (scientists) devised. All electromagnetic waves travel through free space at 300,000 km/sec.
So the waves have wavelength and frequency (so many cycles of propagating waves in a second).
Frequency = 300,000,000 (m/s) / wavelength (m) or
Wavelength = 300,000,000 (m/s) / frequency (cycles/s).
Now a new name was adapted for frequency called ‘Hertz’ (1 cycle/s = 1 Hz).
If you look into any introductory book of higher Physics, the ‘EM’ spectrum is given in the appendix.
At long wavelengths, Radio waves (lengths of several kilometers to 0.3m or 30 cm) can be detected (‘received’ is the word) by Radio telescopes using a particular repertoire of techniques & technologies. Microwaves (0.3m to 0.0005m or 0.5mm), still radio waves, but with a little bit different techniques can be also received. All our satellite communications systems employ it. Since our atmosphere heavily absorbs them, one needs to put up Microwave antennas above in the satellites.
Then comes the Far Infra Red (FIR) region with wavelengths down to ten millionths (a millionth of a meter is called 1 micron, 1 |u) there are various techniques again. About a century & quarter ago JC Bose did pioneering work for which he was accorded the honour ‘now’ of co-inventor of Radio. But that work needs to be taken up afresh. Then comes the middle IR. Same is the case here. In near IR (NIR) till 0.7 micron, vigorous work is in progress. This band is mainly for ‘Remotes’ for electronic equipment. But in all IR (FIR, MIR, NIR) space applications are limited except taking photos with those filters because atmospheric molecules interact freely producing IR and absorbing, as basically IR is ‘Heat waves’. One must go above the atmosphere for good work to be accomplished. The Optical ‘Fibre’ operates at 0.8 |u and is the mainstay in optical communications.
Then comes the work horse – 0.7 to 0.375 micron band in which we see the colours (VIBGYOR; Violet end near 0.375 micron & Red end at 0.7 micron). It is called the Visible Region. Telescope is meant for this region of spectrum. Eye is the main receptor/sensor for this part in electromagnetic waves. Almost all our knowledge of space is due to this window in the ‘EM’ spectrum and is called Optical window. If you are looking at a star or galaxy (either with aids like a ‘Telescope’ or without) or seeing its picture in all fantastic colours, you are indulging in Space (Astronomy) studies. 99% knowledge, work, analysis, Red-shift theories are all in Optical spectrum, a mere sliver of the spectrum with almost an ‘Octave’ bandwidth (it means the ratio of the highest to the lowest wavelengths is 2 : 1).
Beyond 0.375 micron (as I told you a micron is a millionth of a meter) we have Ultra Violet portion again divided into NUV, MUV & FUV merging with soft X rays of Nanometer (a billionth of a meter). Some UV cameras get sent in all missions in the Space probes and such programmes.
X rays : A telescope ‘Chandra’ is orbiting the Earth now to take pictures at wavelengths (my guess) of a fraction of a nanometer.
After that comes the ‘Gamma rays’ portion the sensors are complicated and expensive. These high energy and still higher energy radiations, being high energy radiations readily interact with the stuff of our atmosphere and the energy gets transferred into the excitation of those molecules thus decimating the ‘information’ content. So, one must go much above the atmosphere to build a telescope. Here (in this part of spectrum Electrons don’t have separate existence as they combine with Positrons to produce Gamma ray quanta).
Beyond these lie the zone of extremely high energy particles expressed in Energy units (we need to switch from the nomenclature of billionths to billionth billionths).
The whole spectrum (to my reckoning, in wavelengths spans the known region of 10^6 meters to 10^-12meter; a range with a ratio of end to end of 10^18 that we call 18 decades or that is about 60 octaves) and every region or octave has a different technique and equipment. You can’t have the same antenna to receive TV signals, Citizen band, satellite communications and data receiving, isn’t it? My effort is to outline here that all this constitutes the domain of ‘electromagnetic waves’.
The idea of a telescope (whether Optical, IR, Visible, Radio or UV) is to point it. I don’t want to venture into it even because it is a different kettle of fish altogether.
I haven’t got into the preliminary details even.

How to improve my knowledge about astronomy?

I’m so interested in science, mostly in astronomy. I’m 13 years old and I don’t know how can I improve my knowledge about it.

Can you tell me a good way to memorize stuff and how can I know more about astronomy.

Where i can learn things apart from science in school.

I would suggest a subscription to a magazine such as "ASTRONOMY". I got this magazine when I was about your age, after a few years, if you still have an interest, I would then "graduate" up to "Sky & Telescope", it is good for more advanced amateurs. They both have good web-sites too.

Astronomy vs Astrology

Science & Reason: http://tinyurl.com/ScienceReason

Astronomy vs Astrology – Best of Carl Sagan’s Cosmos (Part 15)

Please subscribe to Science & Reason:
• http://www.youtube.com/Best0fScience
• http://www.youtube.com/ScienceMagazine
• http://www.youtube.com/ScienceTV
• http://www.youtube.com/FFreeThinker
• http://www.youtube.com/SagansCosmos


1) 10 Years After: Carl Sagan & Ann Druyan Reflect:

2) Lost Between Immensity And Eternity:

3) The Realm Of The Galaxies:

4) Our Galaxy, The Milky Way:

5) Our Solar System:

6) Eratosthenes And The Round Earth Model:

7) The Library Of Alexandria:

8) A Short History Of The Universe:

9) Artificial And Natural Selection:

10) The Cosmic Year:

11) Tree Of Life – 4 Billion Years Of Evolution:

12) The Miracle Of Life:

13) DNA – The Common Basis Of Life:

14) Abiogenesis The Origin Of Life:

15) Astronomy vs Astrology:

16) Pictures In The Sky:

17) Ancient Astronomy:

18) Triumph Of Modern Science Over Medieval Superstition:

19) The Mysterious Tonguska Event:

Carl Edward Sagan, Ph.D. (1934-1996) was an American astronomer, astrochemist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI).

He is world-famous for writing popular science books and for co-writing and presenting the award-winning 1980 television series “Cosmos: A Personal Voyage”, which has been seen by more than 600 million people in over 60 countries, making it the most widely watched PBS program in history.

A book to accompany the program was also published. He also wrote the novel “Contact”, the basis for the 1997 Robert Zemecki’s film of the same name starring Jodie Foster.

During his lifetime, Sagan published more than 600 scientific papers and popular articles and was author, co-author, or editor of more than 20 books. In his works, he frequently advocated skeptical inquiry, secular humanism, and the scientific method.


Duration : 0:10:57

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What are some good choices in telescopes for a beginning astronomer?

I’m not interested in a toy telescope, but I’d like to keep the price below $500. I’m so confused by the options! I want to actually be able to see stuff, but I’m not getting another degree in optics in order to work the telescope. Any suggestions?

I have to be quick. In short, a Reflector on a Dobsonian mount. 8-inch aperture which allows you to see faint fuzzy things, as well as planets and multiple stars. Simple to operate. Get a star atlas to go with it. I’m sure others will expand on this.

Where can I find images of what things look like under certain telescopes?

Like I want to compare what things look like under the Orion SkyQuest XT10 and the Orion SkyQuest XT8 telescopes

How big of a difference would it be?

It is pretty tough to describe, since it depends on a lot of related issues like light pollution, eyepieces, and your own observing skills. As Tina suggested, the only way to really compare these is to try them yourself. We can tell you that the 10 inch has roughly 36% more light gathering capability than the 8 inch, but to translate that into a level of brightness as perceived by your own eye is an exercise in futility. I personally own an 11 inch SCT with premium eyepieces, and under clear skies I can see more than most people can imagine. But some folks can look through my scope at a target that is absolutely stunning to me and see virtually nothing. They don’t quite know how to look; it takes some practice to see what is out there.

So, if I were you, I would check out the views at a local astronomy club star party. If that is not possible, I would go with the 10 inch.

What is the difference between Astrophysics and Astronomy?

What is the difference between Astronomy and Astrophysics?
I’m so interested in this kind of area and I want to know which course is more for me.
I got the impression that Astrophysics is much more "mathsy" but I’m not overly sure of which bits are different….

astronomy is the study of the universe. astrophysics is the study of how the universe works, and the laws that take place thereof.

Astronomy Software

Science video on Mars presenting VRMars Astronomy Software. The video shows panoramas and images, including the “Whale” panorama and Martian sunset, taken by NASA’s Mars Rover Spirit during the Mars Rover Mission. The video was created with the use of virtual reality science software VRMars-Spirit – The Red Planet Mars 3D, released by Sciterian Technologies, and powered by the technology VRPresents that gives an impression of being on the surface of Mars. Great astronomy video for those interested in science, and space exploration enthusiasts. Get this astronomy program at www.vrmars.com or www.vrmars.com/VRMars-Spirit-The-Red-Planet-Mars-3D.htm , and enjoy roving Mars. See the planet like you were one of the Mars Rovers at www.vrplanet.com . Credits: NASA/JPL-Caltech/Cornell/MSSS/USGS/OSU/Honeybee Robotics/New Mexico Museum of Natural History and Science – More credits in this astronomy software.

Duration : 0:1:36

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Is there any talk about launching telescopes dedicated to monitoring a single specific celestial object?

Just curious. It seems that for some of the more interesting stars, especially the closer ones, it might be a useful thing to have radio telescopes focused upon them at all times. If ever we detect any appreciable amount of life on a distant planet and have indication that it might be technological, would it behoove us to launch a telescope dedicated just to that world?

The problem is to define interesting. Whatever criteria you use, there well be always dozens of stars that fall into that category. So statistically it pays better to monitor a star for a while, and then to jump to the next.

What are a few good beginner books for astronomy?

If you know of any good or great books for beginners on astronomy, please help me out. Thank you.

I believe one of the best for great reading and to help find deep space objects is "Turn Right at Orion".


What is the difference between telescopes for astronomy and telescopes for stargazing?

I am thinking about buying a telescope but I do not know the difference between these.
I want to use my telescope for just, looking at saturn, mars and other planets, maybe close stars to see what I can see and the space station and satellites!

the same difference between a basball bat designed for hitting vs. one designed for batting.

How did you learn so much about astronomy?

Like, how long did it take for you to really start to understand astronomy and start to learn a lot about it? Also, at what age did you begin to develop an interest in astronomy?

I was 16 when I first got interested in astronomy. Terry Dickinson says it takes about a year to become comfortable with the sky and its motions: it helps to see the same constellations come around again.

Celestron EdgeHD Telescopes

The very latest in the Celestron line is the Celestron EdgeHD – an Aplanatic Schmidt optical system that produces pinpoint star images all the way to the edge of the field. Some optical systems currently on the market may produce coma free images. But there is a difference…. the optical difference. Not only is the Celestron EdgeHD telescope coma free, but it also has a built in field flattener to ensure sharp focus all the way to the edge of the field, producing true Astrograph quality images. This results in pinpoint, High Definition star images throughout your astro photograph! These superior features combined with the Celestron CGE Pro and CGEM mounts make the new Celestron EdgeHD series the new gold standard in Astro Imaging and the system of choice for the serious astro-imagers.

Celestron EdgeHD Telescopes are available for order at OPT – www.optcorp.com !

Duration : 0:4:19

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Is it possible to attend Astronomy Graduate School with a Major in Mathematics and Minor in Statistics?

I am currently going into my senior year in college with a major in math and minor in statistics. I have been told when thinking about grad school that I don’t have to limit myself to studying math, that I can go into different fields having math as a background. If this is true (is it?) then would studying astronomy be possible?

No, you can’t enter an astronomy grad program right now. They expect the equivalent of a physics major, and almost all of them require the physics GRE, covering material you would have learned in intro physics I and II, modern physics, classical mechanics, electricity & magnetism, thermo & statistical mechanics, math physics I and II, optics, and quantum mechanics. Surprisingly, astronomy isn’t required, mostly just physics (and you’ll need some computer science as well) but astronomy helps a lot. Now, you could apply to an astronomy grad school, but you will need to take a lot of these physics classes first or find a low-ranked program willing to let you catch up before starting the masters work (you’ll need to do the masters work before starting the PhD even if you enter a PhD program with a bachelors).

Radio Telescopes

The Sun and stars emits radio waves — not just visible and infrared light. In the 1930s, Karl Jansky built the first devise to “listen” to the sun, collecting radio waves from far off stars and focusing them onto a detector. This invention provided astronomers with a completely different view of the Universe — prompting the discovery of radio stars, quasars, and black holes.

This video features a model of the Algonquin Radio Observatory (ARO), located in Ontario’s Algonquin Provincial Park. In 1968, astronomers combined signals from the ARO with those from the Dominion Astrophysical Radio Observatory in Penticton, British Columbia forming a new instrument called a Long Baseline Interferometer.

To learn more about astronomy and telescopes, visit the Canada Science and Technology Museum.


Duration : 0:3:7

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If we live lightyears away from Earth, can we see the solar system with telescopes?

I don’t know what professional astronomers will say about it but I think we are not going to see Earth and rest of solar system unless with powerful telescopes that can filter Oort Cloud that may block the view.

We will be able to see the solar system, and we can see through the Oort cloud. We do it all the time, from Earth. How do you think astronomers take pictures of stars light years away?
The Oort cloud is not as dense as you may think.

Out side of the solar system, we might now be able to see the inner planets, as they are too small and too close to the bright glare of the sun, but we will see the sun, and the outer planets (Jupiter, Saturn, Uranus, Neptune)

What is a good book that would cover the basics of astronomy?

I am taking a class on astronomy next year. It is the first experience I will have in this science but I’m confident the class will be pretty advanced. I want to go into it knowing a bit about the subject. If you know a book that would cover the basics, or at the least provide good insight into what I may learn, please let me know!

It’s hard to recommend a book without knowing what your math background is. Introductory astronomy classes are usually accessible to high school students, even at the college level – they rarely require more than algebra and a little trig, and there are literally hundreds of introductory textbooks out there.

How to Buy a Telescope : Telescope Buying Guide: What to Avoid

When buying a telescope, be wary of inflated magnification claims and wobbly tripods. Shop wisely for telescopes with the buying tips in this free video on home astronomy from a telescope salesperson.

Expert: Jesse Sturgeon
Bio: Jesse Sturgeon has served as a sales and customer service representative for Anacortes Telescope in Anacortes, Wash. for several years. He enjoys introducing people to the science & art of astronomy.
Filmmaker: Curtis Enlow

Duration : 0:2:19

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Creation Astronomy Propaganda Debunked 02

In this episode, we’ll look at a couple of bogus attempts to undermine science related to Lunar and Solar astrophysics.

I apologise for the somewhat erratic sound/volume in this video. I did not record it all in one go, and I have no idea what I’m doing in iMovie. The next one will be better.

To those who were referred to me by DonExodus2, thank you for checking out my videos and I hope you’ll like what you see enough to subscribe.
To DonExodus2 himself, thank you very much indeed for your support.

Various multimedia in this video was created by NASA/ESA/JAXA/ESO/Berkley/Exeter

1. I apologise, this is just completely wrong. It was thought up until 1965 that Mercury was tidally locked to the Sun, but was proven to have 3:2 spin orbit resonance. That means for every 2 years on Mercury, there are 3 days. One Mercurian year is about 88 Terran days and one Mercurian day about 59 Terran days. I think I was once told that Mercury *was* thought to be tidally locked with the Sun, and confused that to mean it was the current consesus. Again, sorry!

Music in this video:
Sven-g-englar – Sigur Ros
Veridis Quo – Daft Punk
Exodus Honey – Honeycut

Duration : 0:9:52

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Why do astronomers use reflecting telescopes rather than refracting telescopes?

Reflecting telescopes consist of a set of curved mirrors used to focus light. With a concave mirror in the back it consentrates the light making the image brighter.

Refracting telescopes is an optical telescope the refracts light at each end using lenses.

So why do astronomers prefer refracting telescopes other than reflecting?
All help is appreciated!

Refracting telescopes put a very serious limitation on how large the telescope’s aperture can be because they require a large area of unsupported glass. Reflecting telescope mirrors can be supported from behind, so can be built in almost any size. Since aperture is the most important characteristic of modern telescopes, all modern research instruments are reflectors.

What textbook on astronomy should I buy?

It’s for a competition relating to only variable stars and I know basically nothing about astronomy. I don’t need a book on how to observe them, just more on the information about them. It would also be helpful if it would contain information about the most famous ones.

I use "Discovering the Cosmos" by R.C. Bless for my college astronomy 101 course. It has a good deal of info on stars and the sun

Hubble Telescope Replacement: The James Webb Space …

Last week we did a story on the Hubble telescope and the upcoming and final servicing mission to fix it up. The James Webb Space Telescope was mentioned, but not many details were given. This video found on the NASA site shows what is new with JWST, why it is better than the Hubble and a bit of what we can expect. The telescope is still being built and it is possible it will be delayed a bit, but JWST is scheduled to fly no earlier than 2013, so we have a bit of time to admire the images from Hubble a bit longer.

Duration : 0:9:56

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how might telescopes help astronomers fight extra-terrestrial intelligence in the universe?

1)how might telescopes help astronomers fight extra-terrestrial intelligence in the universe?

2)what are the advantages of using satellites for ocmmunication?
3) Whatis special about the period of orbit of a geosynchronous satellite??


1) I don’t no why you need to fight it, but then again the human race likes war so we probably would. But it could let us see an attack or a race of people coming towards us so that we could get defenses ready

2) It is better to use satellites because they can cover a wider area then something such as a telephone wire.

3) I have no clue

What is a good science fair project for astronomy?

Science fair projects are meant to solve problems, not to show how something works. I’d really like to do a science fair project in the astronomy category but I can’t think of any problems that could be solved by me in astronomy. If you have any suggestions, I would greatly appreciate seeing them.

Are you kidding? Astronomy is perhaps the one science left where the amateurs can contribute as much as the professionals, indeed many professionals rely on information e-mailed to them by amateurs.

A strong pair of binoculars and a lot of patience is all you need to discover your own comet. New comets are being discovered on an almost daily basis. Once you have found a comet with your binoculars (you can easily spot the ones near the earth as they are bright enough to be seen with binoculars and have a distinct fuzzy tail thrown out by solar winds) then you can look up the location on an astronomical web site (there are many) to see if it has already been catalogued if it hasn’t e-mail some professionals and see if they can independently verify your observation and you not only have your science project but you have made a contribution to the astronomical community.

That’s something simple anybody at any age can do, if you want something more technically complex then you could register with the Slooh web-site and have a chat with professional astronomers about your question.


While you’re there take a good look at their awesome telescopes.

Telescope Making


1k Views 7/26/08
10k Views 3/6/09

This is my father’s garage where he is currently working on his telescope hobby.

The glass casting oven is a oven made from scratch where it is able to make up to a 20′ mirror blank.

Diamond Curve Generating Machine/Mirror grinding & polishing- Own personal design/invention, uses a roller coaster, where the diamond grinder rides the curve track. Able to do any curve of radius(negative or positive) because of the spring steel track design. Able to grind/polish up to a 32′ mirror.

40′ Vacuum Tank. The mirror sits vertical, attaching itself to the door with an aluminum ring. Vaporization process is horizontal.

Our Goal;
Seeing amateur astronomy going to a larger level & to promote larger telescope making in amateur astronomers

If you have any further questions regarding this video and its contents, please feel free to email;


#77 – Top Favorites (Today) – Science & Technology – Global


Glass casting mirror blank telescope mirror aluminizing metal vaporization space oven constellation glass art

amateur astromony anstromers telescope making home made atm vaccum chamber grinding machine diamond curve generator

Duration : 0:7:54

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2012 Questions: NASA Astronomer Responds to Conspiracy Theorists

Complete video at: http://fora.tv/2010/04/24/David_Morrison_Surviving_2012_and_Other_Cosmic_Disasters

NASA scientist David Morrison shares some of the most outrageous questions and comments he has received regarding 2012 and Nibiru (“Planet X”) conspiracies. One of his favorites? “I am getting tired of all the CIA and NSA planes buzzing around my house in circles like I am some freak at a carnival show.”


This program was recorded in collaboration with the 2010 SkeptiCal Conference, in Berkeley, CA, on April 24, 2010.

Dr. David Morrison is the Director of the NASA Lunar Science Institute and Senior Scientist for Astrobiology at the NASA Ames Research Center. He holds a Ph.D. in astronomy from Harvard and is internationally known for his research on small bodies in the solar system, including advocacy for developing plans to defend the Earth from impacts by comets and asteroids.

A Fellow of CSI, he has written extensively on such fringe science topics as Velikovsky, cosmic catastrophes, UFOs, the creation science movement, and most recently the climate crisis caused by global warming. For the past two years he has been the primary scientist critic of the widespread fear that the world will end in 2012, and of the doomsday sleaze artists who use the Internet, blogs, and cable TV to frighten people for profit.

Dr. Morrison’s discussion largely centers around the hoax of 2012. – SkeptiCal Conference

David Morrison is the senior scientist at the NASA Astrobiology Institute, NASA Ames Research Center, Moffett Field, Calif., where he participates in a variety of research programs in astrobiology — the study of the living universe.

Dr. Morrison obtained his doctorate in astronomy from Harvard University. He is the author of more than 155 technical papers and has published a dozen books. He has been a science investigator on NASA’s Mariner, Voyager and Galileo space missions. Morrison is recipient of the Dryden Medal for research of the American Institute of Aeronautics and Astronautics, the Sagan Medal of the American Astronomical Society for public communication, and the Klumpke-Roberts award of the Astronomical Society of the Pacific for contributions to science education. He has received two NASA Outstanding Leadership medals and he was awarded the Presidential Meritorious Rank for his work as director of space at NASA Ames. Morrison was a founder of the multidisciplinary field of astrobiology, and he provides on-line answers to questions from the public sent to “Ask an Astrobiologist,” found at: http://nai.arc.nasa.gov/astrobio/

Morrison is perhaps best known for his leadership since 1991 in defining the hazard of asteroid impacts and seeking ways to mitigate this risk. Asteroid 2410 Morrison is named in his honor.

Duration : 0:5:29

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Telescopes mounted on Earth-orbiting satellites are better for observing the universe because they?

Telescopes mounted on Earth-orbiting satellites are better for observing the universe because they

1. collect only gamma radiation for images.

2. are outside the influence of Earth’s atmosphere.

3. collect only infrared radiation for images.

4. can be remotely controlled.

Answer #2
A powerful telescope on earth is still at a disadvantage with a mediocre telescope above Earth’s orbit because of the atmosphere that can scatter light coming in from space.

So yes, they are better because they are not influenced by the Earth’s atmosphere.

How to Buy a Telescope : Telescope Buying Guide: Low Cost Options

Excellent quality telescopes can be purchased for less than $500. Save money when shopping for telescopes with the buying tips in this free video on home astronomy from a telescope salesperson.

Expert: Jesse Sturgeon
Bio: Jesse Sturgeon has served as a sales and customer service representative for Anacortes Telescope in Anacortes, Wash. for several years. He enjoys introducing people to the science & art of astronomy.
Filmmaker: Curtis Enlow

Duration : 0:3:45

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Amateur Astronomy Sky this Week for May 30 to June 5, 2010

The asteroid Ceres passes through Messier 8 the lagoon nebula on Monday and Tuesday evening — photo op!

Only 3 hours and 17 minutes of astronomical darkness on Saturday evening. Not many mosquitoes yet fortunately.

Comet C2008 R1 (McNaught) is now about magnitude 7.8 and expected to brighten as it nears the Sun, may get to magnitude 2 according to some predictions. Take a look around 4:15 am.

Duration : 0:4:32

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What do telescopes allow you to see?

I know telescopes allow you to see the moon and images of certain planets, but does it actually allow you to see in depth detail of star clusters etc.?

I would apprectiate experienced opinions please.

Stars are points of light. A telescope might let you see some color.

Detail can be seen on the Moon, nebulae, some galaxies. Open clusters become lots of dots. Globular clusters can become lots and lots of dots. Many stars become double and triple stars.

Venus shows a crescent. Mars shows polar caps and certain large features. Jupiter has bands, swirls, the GRS, and moons. Saturn has rings, some bands, and moons. Uranus shows a colored disk, as does Neptune. Pluto is a dot.

There may be heavenly views through a neighbor’s window. The Earth is generally close enough to touch.

What college major should I go into besides astronomy, if I love space?

I have always been obsessed with anything that has to do with space. Looks like you need to know physics, calculus, etc to get a degree in astronomy. Is there any other option for me?

Engineering physics or Aerospace engineering. However, if you really want to understand space; you need Multilinear Algebra. So you understand, mapping points to themselves in 4d space.

How to Buy a Telescope : Telescope Buying Guide: Reflecting Telescopes

A reflecting telescope should only be used for night sky viewing. Discover the difference between reflecting and refracting telescopes in this free video on home astronomy from a telescope salesperson.

Expert: Jesse Sturgeon
Bio: Jesse Sturgeon has served as a sales and customer service representative for Anacortes Telescope in Anacortes, Wash. for several years. He enjoys introducing people to the science & art of astronomy.
Filmmaker: Curtis Enlow

Duration : 0:1:34

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Microsoft’s Free Astronomy Software

http://live.pirillo.com – Even if you’re not really “in to” Astronomy, you really have to check this out. The things you will see are just amazing. Go ahead… I dare you. Open your eyes, broaden your horizons. You never know what’s out there waiting.

Duration : 0:5:25

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Do you know of any best telescopes for land viewing ?

Any best "terrestrial" telescopes ? To look high up into the mountains into the woods with at birds? The view of them be 100 yards away. So many interesting animals to see. And Binocular’s won’t do.

Are there any available for under $600.00 US or as near as possible. Or Would a a monoscope do for less?

Thanks in advance.

http://www.telescope.com/sdx/H3171.jsp…hope this helps.

what was one of the great discoveries in astronomy during the 20th century?

One of the great discoveries in astronomy during the twentieth century was that
A) there used to be life on Mars.
B) at the largest scale, galaxies are randomly distributed in space.
C) our star, the Sun, is located outside of the Milky Way.
D) our galaxy is alone amongst the other galaxies; it is not part of a cluster of galaxies.
E) our galaxy is only one of many billions in the universe.


How to Use Telescopes : How to Align Telescopes on Equatorial Mounts

Telescopes should be aligned on equatorial mounts, often centering on the North Star, to ease following celestial bodies over time. Align Schmidt-Cassegrain telescopes with an observatory director in this free astronomy video.

Expert: Rocky Alvey & Billy Teets
Bio: Rocky Alvey is the assistant director of the Vanderbilt Dyer Observatory and has been involved in astronomy since 1969.
Filmmaker: Dimitri LaBarge

Duration : 0:4:3

Continue reading

What are the types of telescopes and Cameras?

i would like it in terms of science, refracting telescopes.etc.
What are the advantages and disadvantages of each one of them.
A website would be helpfull

From Answers.com:
Optical telescopes
Three main types of optical telescopes – and these are divided into subgroups. They all have their different advantages and disadvantages and they are used in different areas of astronomy.

Refractor telescopes (Dioptrics)

* Non-achromatic
o Galilean telescope
+ Galileoscope
o Keplerian Telescope
+ Aerial telescope
* Achromatic telescope
* Apochromatic
* Superachromat
* Varifocal gas-lens telescope

Reflector telescopes (Catoptrics)

* Newtonian telescope
o Dobsonian telescope
* Gregorian telescope
* Cassegrain telescope
o Ritchey-Chrétien telescope
o Dall-Kirkham
* Large liquid mirror telescope
* Pfund telescope
* Schiefspiegler telescope
* Toroidal reflector / Yolo telescope
* Herrig telescope
* Stevick-Paul telescope

Combined Lens-Mirror Systems (Catadioptrics)

* Schmidt camera
* Schmidt-Newton telescope
* Schmidt-Cassegrain telescope
* Lurie Houghton
* Maksutov telescope
* Modified Dall-Kirkham telescope
* Klevtsov-Cassegrain
* Argunov Cassegrain telescope
My favorite is the Catadioptric Newtonian Telescopes.

Read all about telescopes here:
and here:

😀 I actually only use binoculars! It is too cloudy here! 🙁