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Dwarf planet Pluto is seen in an image taken by the Hubble Space Telescope.

Latest Discoveries About Pluto, the Dwarf Planet

By SPACE.com Staff

The solar system's runt.

Big Fireball on Jupiter Spotted by Amateur Astronomers

Jupiter: Latest Discoveries and Photos

By SPACE.com Staff

Learn the latest discoveries about Jupiter and its many moons and rings.

Venus' southern hemisphere, as seen in the ultraviolet.

Latest Discoveries on Venus, Second Planet From the Sun

By SPACE.com Staff

Learn the latest discoveries about Venus.

Whole New Mercury Promised by NASA Spacecraft

Mercury, First Planet From the Sun: Latest Discoveries

By SPACE.com Staff

Learn the latest about Mercury, our solar system's smallest planet.

The twin of NASA Spirit rover, the robotic explorer Opportunity is also alive and well more than four years after its Jan. 25, 2004 (ET) landing.<br><br> Opportunity landed on the flat plains of Meridiani Planum, which sits on the side of Mars opposite Gu

Mars the Red Planet: Latest News and Discoveries

By SPACE.com Staff

Mars is the fourth planet from the sun. See the latest discoveries on the Red Planet.