1. Stars in my image of the Big Dipper or Plough, a well-recognized Asterism that's part of Ursa Major, taken with a Canon EOS 20D and 17-40 zoom lens at f/4 from a dark spot on the south shore of Lake Okeechobee in Florida in February 2006.
2. An evening shot of the nearby horizon and the sky (noting the crescent moon) showing several constellations including Orion, likely taken somewhere near where Jerry Lodriguss lives.
3. Tracks of the Mars Rover Opportunity on a dust dune on Mars, taken by Opportunity herself.
4. An infrared false color image of the B33 (Horsehead) area in Orion. The transparent-looking (at these wavelengths) dusty head of the horse can be seen just above the clouds at the upper-right. Taken with the ISOCAM imager at (I think) Stockholm Observatory.
5. A wide field infrared false color image of M33, the Andromeda Galaxy and intervening Milky Way stars, taken by the Wide-field Infrared Survey Explorer (WISE) satellite.
6. The planet Neptune showing clouds encircling an extraterrestrial cyclone near the south pole, taken (I think) through the Hubble Space Telescope.
7. A high resolution image of the Iris Nebula (NGC 7023) in Cepheus showing reflection (blue) and emission (red) nebulae, along with dark (dust) nebulae, taken through the Canada-France-Hawaii Telescope (CFHT).
8. Jupiter's satellite Io showing emissions and glow from the volcano Tvashtar at the upper-right, taken by the New Horizons spacecraft.
9. An unusual ring galaxy called Hoag's Object, or PGC 54559, in Serpens. Taken with the Hubble Space Telescope.
10. Thor's Helmet, aka NGC 2359, a nebula emitted by an unstable Wolf-Rayet (WR) star. A somewhat false color image (it's skewed to red/magenta) taken by Don Goldman through a RCOS 16" Ritchey-Cretien telescope using narrow band filters for Hydrogen Alpha, Oxygen III, and also combined with RGB visual color exposures.
11. Not the Death Star, but Saturn's satellite Mimas showing the huge 140 km wide Herschel Crater. Taken by the Cassini spacecraft.
12. Star cluster NGC 602 and surrounding nebula, in Hydrus near the Small Magellanic Cloud. False color image taken through the Hubble Space Telescope.
13. IC 418 aka The Spirograph Nebula in constellation Lepus. Taken through the Hubble Space Telescope.
14. The Great Nebula in Carina (Carina Nebula) in southern skies. Taken through the CTIO Curtis-Schmidt Telescope in Chile.
15. The Umbrella Galaxy, aka NGC 4651, showing a spiral galaxy likely consuming another, smaller one. Taken by R Jay GaBany through the 2.5 meter Issac Newton telescope the 0.5 meter Blackbird Observatory telescope.
16. Centaurus A, aka NGC 5128, lenticular galaxy with prominent dust lane in the constellation Centaurus. Not sure who took this image, but it looks like those made with the CFHT.
17. The Ant Nebula, aka MZ 3 (Menzel 3), which is a bipolar planetary nebula I have always thought greatly resembles the nebula of Eta Carinae. This is clearly a high resolution Hubble Space Telescope image as the object is quite small.
18. Our own Sun, aka Sol, imaged in ultraviolet light by the Solar Dynamics Observatory.