Galaxy Nature Outer space Universe Astronomical object Nebula Space Astronomy Atmosphere Celestial event Darkness Atmospheric phenomenon Sky Star Science Night Stock photography Graphics Spiral galaxy Midnight Circle World Art Nebula Hubble Space Telescope Sh2-106 Hubble Heritage Project NGC 6302 Star Engraved Hourglass Nebula Emission nebula Telescope Galaxy Image Reflection nebula Cygnus Loop Space Trifid Nebula