While NASA’s Hubble is one of the largest and most well-known space telescope for astronomy, it’s the not the only one NASA uses. In fact, there are four large, powerful space-based telescope that fall under NASA’s series of Great Observatories – Hubble, the now deorbited Compton Gamma Ray Observator (CGRO), Chandra X-ray Observatory (CXO) and Spitzer Space Telescope (SST). Each serves a particular function (Hubble – visible light and near-ultraviolet, CGRO – gamma rays, hard x-rays, CXO – soft x-rays, and SST – infrared spectrum), examining a specific region of the electromagnetic spectrum.

[Source: MMT]