The Hubble Space Telescope has dazzled us for years with its unbelievable images of breathtaking cosmic phenomena. In honor of its 20th anniversary in orbit, we're sharing what we think are some of Hubble’s best photos. This composite color infrared image is a sweeping panorama of our galactic home – the Milky Way. Along with the Spitzer Space Telescope, Hubble captured the core of our galaxy, which hosts massive star clusters and gassy bodies. Astronomers have used this image, created from several shots collected between Feb. 22 and June 5, 2008, to track how stars react to changing environments.