The bright blue marble of Neptune glows across the horizon of its scarred and pockmarked largest moon, Triton, in this composite image. The foreground is a computer-generated view of Triton's maria—large, flat areas—as they would appear from a point approximately 28 miles (45 kilometers) above the surface.
This montage of Voyager spacecraft pictures shows the eight planets, plus four of Jupiter's moons, sprawled against the backdrop of the Rosette Nebula and on the horizon of Earth's moon. In addition to the planets and moons seen in this simulated photo, our solar system contains stars, asteroids and comets, and dwarf planets such as Pluto.
Saturn's rings appear blue in this false-color image taken from Cassini. The planet's northern hemisphere is about twice as bright as its southern hemisphere, because high-level, fine particles are about half as prevalent in the northern hemisphere as in the south. These particles block Saturn's glow more strongly, making it look brighter in the north.
A total of 126 images taken over the course of two hours make up this mosaic picture of Saturn. The Cassini-Huygens spacecraft snapped the photos on October 6, 2004, when it was approximately 3.9 million miles (6.3 million kilometers) from Saturn. Cassini was on a four-year mission to explore the ringed planet.
This enlargement of a 1993 Hubble Space Telescope image shows the brightest nuclei in a string of approximately 20 objects that comprise Comet P/Shoemaker-Levy 9 as it hurtled toward a July I994 collision with the giant planet Jupiter. Shoemaker-Levy 9 was the first comet discovered to be orbiting a planet, Jupiter, instead of the sun.
The moon's lunar highlands (light areas) and maria, or volcanic plains, (dark areas) are clearly visible in this photograph taken by the Expedition 10 crew onboard the International Space Station.
Earth seems to fill the sky in this image taken by the crew of Apollo 17 in 1972. The picture marked the first time astronauts were able to photograph the south polar ice cap.
Photograph courtesy NASA