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 … Continue reading

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 … Continue reading

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 … Continue reading

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 … Continue reading

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 … Continue reading

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 … Continue reading

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 … Continue reading

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

Composite telescopes have greater focal lengths and more compact designs than standard telescopes. Find out how composite telescopes differ from other telescopes in this free video on home astronomy from a telescope salesperson. Expert: Jesse Sturgeon Bio: Jesse Sturgeon has … Continue reading

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

A refracting telescope is the most common kind of telescope. Discover the difference between refracting and reflecting telescopes in this free video on home astronomy from a telescope salesperson. Expert: Jesse Sturgeon Bio: Jesse Sturgeon has served as a sales … Continue reading

Spitzer Space Telescope: The Musical

A singing NASA supervisor uses song to explain about NASA’s Spitzer Space Telescope, and how infrared astronomy differs from visible-light telescopes like Hubble. Starring Danny Tieger (“My Universe Revolves Around You”), Buffy Henshaw (“Behind the Scenes: When Galaxies Collide”), and … Continue reading

Hubble Space Telescope Directly Observes Exoplanet

Hubblecast 22: Hubble Space Telescope Directly Observes Exoplanet Orbiting Fomalhaut. The NASA/ESA Hubble Space Telescope has discovered an extrasolar planet, for the first time using direct visible-light imaging. The strange world is far-flung from its parent star, is surrounded by … Continue reading

Hubble’s Successor: The James Webb Space Telescope

Science@ESA (Episode 4): Following The Redshift (Part 2) – Hubble’s Successor: The James Webb Space Telescope. In this fourth episode of the Science@ESA vodcast series Rebecca Barnes will identify some of the key discoveries achieved with the famous Hubble Space … Continue reading