2MASS 2MASS galaxy catalog 2012 3200 Phaethon adaptive optics Alvaro Orsi Andromeda Galaxy Arp 194 asteroid asteroids astronomical event ATLASGAL atomic clock aurora Betelgeuse Big Bang Bolide Brown dwarf Cassiopeia A Chandra telescope Chandra X-Ray Observatory climate clouds collision comet comets Comet Tempel-Tuttle computer model computer models computer simulation conjunction Cosmic collision cosmology crater dark matter data manipulation Deep Impact Durham University dust dwarf galaxy Earthgrazers Earthshine Echo satellite eclipse Evening Visibility exploration extrasolar planet extrasolar planets Fireball Fireballs first stars Full Moon galactic plane galaxies galaxy galaxy cluster galaxy group gamma-ray burst gamma ray burst Ganymede gas Gemini Geminids GRB Hayden history hoax Hubble Space Telescope ice ice age impact infrared infrared light International Space Station Jupiter launch LCROSS magnetic field magnetosphere Mars meteor Meteors meteor shower Moon NASA night sky observation planet rock satellite solar eclipse Solar System space shuttle star star formation Stars Sun sunset the Sun Umbra Venus