Earth’s atmosphere blocks most gamma rays, so most gamma-ray telescopes are carried on satellites and balloons. However, some ground-based telescopes can observe the Cherenkov radiation produced when a gamma ray strikes Earth’s upper atmosphere. The first gamma-ray telescope was carried on board the American satellite Explorer 11 in 1961.
That said, catadioptric telescopes fall into the group of optical telescopes. Also called compound telescopes, they are hybrid scopes which combine lenses and shaped mirrors to form an image of the object. These telescopes combine the best features of reflectors and refractors in one package.
The NexStar Series of Telescopes from Celestron is a very well-established line that has been around for years. In fact, in homage to its roots, the bright orange color of the NexStar SE line resembles the original C8 tube telescope that helped Celestron establish its place in the world of astronomy.
Thanks to its lightweight and compact construction you can easily take this refractor telescope with you almost anywhere. Buy from Amazon.com for ($35.99) In-depth information . If you are looking for a powerful telescope that is still easy to operate and portable, you might want to consider this model from Geertop.
The LightBridge Truss-Tube Dobsonian telescopes set up quickly, allowing you to take one of these massive windows to the universe out to your favorite dark sky location. Coming in 10", 12", and 16" aperture sizes, these huge telescopes combine quality and portability with affordability.
Submillimeter ("microwave") astronomy is technically very difficult due to the sheer complexity of the instrumentation and to the "opaqueness" of the atmosphere in microwave light. The Submillimeter (a.k.a. "microwave") frequency band lies between the regions easily observed by radio telescopes and optical telescopes.
Reflecting telescopes are cheaper to make. Reflecting telescopes don’t suffer from chromatic aberration. A variation on the standard Newtonian telescope is the Cassegrain reflector, which uses a curved secondary mirror to bounce the light back down the length of the tube to an eyepiece at the bottom end.
Refracting telescopes use lenses. There are different kinds of reflectors, but in general the refractors all follow the same basic design. Stargazing: Refracting telescopes. Refracting telescopes use lenses to collect and focus the light, just like binoculars do. In fact, you can think of a refracting telescope as one half of a giant pair of binoculars.
Ultraviolet telescope, telescope used to examine the ultraviolet portion of the electromagnetic spectrum, between the portion seen as visible light and the portion occupied by X-rays. Ultraviolet radiation has wavelengths of about 400 nanometres (nm) on the visible-light side and about 10 nm on the X-ray side.