This page lists a number of images uploaded to Wikipedia which I consider some of the best I have come across on the site.

• Image:HD 69830 Planet.jpg - artist's impression of a planet (HD 69830 b) orbiting the star HD 69830, with the star's asteroid belt in the background
• Image:Ssc2006-10c.jpg - artist's impression of the first extrasolar planets to be discovered, orbiting the pulsar PSR 1257+12
• Image:Ssc2005-01b.jpg - artist's impression of the collision of two dwarf planets orbiting Vega
• Image:Artist's impression of pulsar planet B1620-26c.jpg - artist's impression of the 12.7 billion-year-old planet PSR B1620-26c orbiting the binary star PSR B1620-26
• Image:OGLE-2005-BLG-390Lb.jpg - artist's impression of the planet OGLE-2005-BLG-390Lb orbiting OGLE-2005-BLG-390L, a probable red dwarf
• Image:HD1888753ab.jpg - artist's impression of the view from a hypothetical moon orbiting HD 188753 Ab, which in turn orbits the star HD 188653 A in the triple star system HD 188753
• Image:GJ876b.jpg - artist's impression of the planet Gliese 876 b orbiting the red dwarf Gliese 876
• Image:Gl876 planet1 h.jpg - artist's impression of the possible appearance of Gliese 876 d, a planet orbiting Gliese 876
• Image:HD209458b.jpg - artist's impression of the planet HD 209458 b transiting HD 209458, a Sun-like star
• Image:Moon-craters.jpg - the crater Daedalus and several smaller ones, as photographed by Apollo 11
• Image:Aldrin Apollo 11.jpg - Buzz Aldrin walks on the surface of the Moon
• Image:Moon-apollo17-schmitt boulder.jpg - Apollo 17 astronaut Harrison Schmitt, the twelfth man to walk on the Moon, near a boulder on the surface
• Image:Schmittonmoon.jpg - Harrison Schmitt collecting lunar specimens during the Apollo 17 mission
• Image:The Earth seen from Apollo 17.jpg - The Blue Marble, the famous photograph of the Earth, taken during the same mission, probably by Schmitt
• Image:Accretion disk.jpg - artist's impression of a binary star system consisting of a black hole and a main sequence star; the matter from the star forms an accretion disc around the black hole, with relativistic jets emerging from its center
• Image:Gb1508 illustration.jpg - artist's impression of quasar GB1508
• Image:Reprocessed Mariner 10 image of Mercury.jpg - composite image of Mercury by Mariner 10
• Image:Mgn p39146.png - computer-generated image of impact craters on the surface of Venus
• Image:Venustransit 2004-06-08 07-49.jpg - Venus transiting the Sun in 2004 (alternate image)
• Image:Venus2 mag big.png - image of the surface of Venus obtained through radar mapping by the Magellan probe
• Image:Mars Valles Marineris.jpeg - composite image of Mars by the Viking 1 orbiter, featuring Valles Marineris
• Image:Olympus Mons.jpeg - Olympus Mons on Mars, taken by Mars Global Surveyor in 1998
• Image:Vikinglander-view.jpg - Viking 1 landing site on Mars
• Image:Vl1.jpg - Viking 1's first black-and-white panoramic view from the surface of Mars
• Image:MarsSunsetCut.jpg - a Martian sunset, taken by Spirit at Gusev Crater (alternate version)
• Image:NASA Mars Exploration Rover.jpg - artist's impression of an exploration rover on the surface of Mars
• Image:Pancam Sol1 Postcard part th361.jpg - first color panorama of the Martian landscape taken by Opportunity at Meridiani Planum
• Image:08-AY-3-shiny-B026R1 br.jpg - part of a trench dug by Opportunity on Mars, showing shiny, spherical object in the trench wall
• Image:Burns cliff.jpg - Burns Cliff inside Endurance Crater on Mars; taken by Opportunity
• Image:Heat Shield Rock Sol339B P2581-med.jpg - Heat Shield Rock, the first meteorite identified on a celestial body other than Earth (image of Opportunity's discarded heat shield with Heat Shield Rock in the background)
• Image:Naturaliste crater site A47 cyl-med.jpg - Naturaliste Crater, Meiridani Planum, Mars; taken by Opportunity
• Image:Opportunity Sol468 HazCam.JPG - Opportunity's back wheels dig into Martian soil
• Image:Erebus 360 L257atc-B652R1.jpg - panorama on the rim of the Erebus Crater; taken by Opportunity
• Image:55172main apollo hills.jpg - panorama of Apollo 1 Hills taken at Spirit's landing site
• Image:Bonneville crater.jpg - Bonneville Crater on Mars; taken by Spirit
• Image:Lahonten crater.jpg - Lahonten Crater; taken by Spirit
• Image:Spirit Lookout L256t-A413R1 br2.jpg - Larry's Lookout, panorama; taken by Spirit
• Image:Gusev Crater, Mars.jpg - an albedo feature on the south side of Husband Hill on Mars dubbed El Dorado; taken by Spirit
• Image:Ra4-protoplanetary-disk.jpg - artist's impression of a protoplanetary disc
• Image:Venus-venera13-right.jpg - Venus' surface; taken by Venera 13
• Image:Viewfromtitan2.jpg - artist's impression of the view from Titan (made by User:Debivort)

• Image:Headwaters of the Sacramento River-750px.JPG - a pretty good image of a headwater of the Sacramento River
• Image:Georgia Aquarium - Giant Grouper.jpg - a giant grouper surrounded by golden trevallies at the Georgia Aquarium (featured picture)