The moon appears full and bright in the sky as a happy family takes turns peering at it through the lens of the telescope. As they gaze at it in the chilly fall air, they can make out the craters in its surface clearly. Using a telescope is one of the best ways to gaze at the stars. It allows you to see astronomical bodies, such as the moon and sun, more clearly, although the sun requires specialized filters to do so. You can also study far-off planets, such as Jupiter, Mars, and others within our solar system. You can also see distant star clusters and nebulae, among other space objects. The most popular type of telescope is a reflector telescope, which uses mirrors to form the image. Refractor telescopes use a lens, and a catadioptric telescope uses both. You can find a large selection of new and used telescopes on eBay.