Carson’s SkyView Short-Tube Wide-Angle Telescope is a lightweight, refractor type telescope that is rugged, compact, and easy to use. It has an 80mm objective lens with a 350mm focal length, and is equipped with two removeable Kellner Eyepieces (6mm/25mm). The finder scope is 8x21mm, and a folding table-top tripod is supplied.
The Hows and Whys of Science kit from Educational Insights allows your child to explore a variety of scientific concepts related to Astronomy, biology, ecology and magnetism. The kit includes instruments and materials to conduct science experiments including: a telescope, beaker, test tubes, bug viewer, rock samples, compass, optical prism, generator flashlight and more. The step by step guide has color illustrations.
My question is in two parts:
What electromagnetic frequency reaches further into space as a clearly discernible signal: TV or Radio (am or fm)?
At what maximum distance could our radio Telescopes be placed such that they still receive a clean, man-made signal from earth?
AM tends to be reflected back to Earth, at least at night, which is why at night you can pick up distant AM stations. FM goes right on out, though, as does TV. We sit at the center of an expanding sphere, currently 110 lightyears in radius, of broadcasts, assuming Marconi’s original signals got out. Current technology could pick up our signals out to about 250 ly, although of course we don’t have signals out that far yet.
A study that was published in Science magazine years ago suggested that aliens receiving our signals could determine the size of the Earth. length of the year and day, size of Earth’s orbit, that we have a moon and its orbital period, mass of Earth, Moon and Sun, and a rough idea of the distribution of humans on Earth.
I am a beginner, What is the best combination of 2 Astronomy binoculars that can help to enjoy the view most? Please advise?
A hand-held pair such as 10×50, and a tripod-mounted pair such as 15×70 or 20×80. Get the smaller pair first and get some experience learning the sky before investing in a larger pair.
Personally, when doing binocular observing (under light-polluted skies) I will use a pair of 15×70 hand-held (not everyone can adaquately hand-hold binoculars of this size and magnification) along with a tripod-mounted pair of 25×100 binos. But you need a beefy mount/tripod for such a pair, which is an additional expense.
Telescopes functioning at visible wavelenfths don’t have to worry a bout thermal radiation from their surroundings, but infared Telescopes do; infared detectors are usually cooled by liquid nitrogen or liquid helium. Why?
Thermal radiation *is* infrared radiation, that’s why. Not cooling an infrared telescope would be like having an optical telescope made of luminescent materials in a floodlit football field! You’d never see anything through the light already pouring into your eyepiece.
The body of the infrared telescope itself can absorb the infrared radiation and then re-emit it as it warms up. The detector would be overwhelmed by its own infrared emissions and would be unable to detect distant sources. By cooling it with liquid nitrogen or helium you prevent the telescope itself from emitting infrared, and so it can distinguish distant sources.
What is the difference between Astronomy and cosmology? Are they the same thing? Also what is astrophysics?
Cosmology is the study of the universe taken as a whole. At the current size of the universe, cosmology deals with structures no smaller than superclusters of galaxies. Astronomy deals with structures smaller than the universe as a whole, such as galaxy clusters, galaxies, stars, black holes, supernovae, planets and so forth. Cosmology is more theoretical than astronomy, and astronomy is more observational than cosmology.
The Celestron PowerSeeker series of telescopes is designed to give the first-time buyer the perfect combination of quality, value, features and power. Offering exceptional value, these Telescopes feature portable yet powerful designs with ample optical performance to excite any newcomer to the world of amateur astronomy.
PRODUCT FEATURES:
Easy to assemble 80mm German Equatorial refractor;
78% brighter images than a 60mm telescope;
Pre-assembled aluminum tripod and accessory tray;
Slow motion controls for smooth tracking;
3x Barlow lens triples the magnifying power of each eyepiece;
FinderScope: 5×24;
Includes two 1.25″ eyepieces and Star diagonal;
Includes CD-ROM “The Sky” Astronomy Software;
Suitable for celestial and terrestrial viewing.
Take a visual and audio tour of the sun moon and planets plus test your knowledge of Astronomy with this interactive Solar System Projector.Projects bright clear images of the sun moon and 8 planets on walls and ceilings10 full-color imagesProjects
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Includes a history of Astronomy, Space Dimensions, The Solar System, Stars, Properties of Light, Galaxies, and more.
