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See some of the wildest space tech concepts, as well as technologies needed to ensure humanity's expansion across the solar system.

Mars Rovers Spirit and Opportunity are 6-wheeled, remotely operated explorers on the planet Mars.

Get the latest news on 3D printing in space. See how NASA and private companies are making space manufacturing and on-demand parts a reality.

NASA's MAVEN mission is expected to investigate the mystery of how ancient Mars went from being a wet world to the cold, dry desert it is now. See the latest MAVEN news, photos and video here.

Images from the early days of NASA and spaceflight.

Learn the latest news about space tourism and space tourist trips into outer space.

There may not be a lot of air, but there's still a lot of weather in space. Get the latest news of space weather and solar flares here from SPACE.com.

See the latest news about space debris and junk in space.

The Mars rover Curiosity, also known as the Mars Science Laboratory, will launch in late 2011 and land on the Red Planet in August 2012.

Latest discoveries and photos about Earth from space.

NASA's Space Launch System is a heavy-lift rocket designed to carry astronauts to an asteroid and Mars.

Stars are giant, luminous spheres of plasma. Galaxies consist of stars, stellar remnants, dust, gas, and dark matter, bound together by gravity. Learn more about stars and galaxies.

A black hole is a location in space that possesses so much gravity, nothing can escape its pull, even light.

At SpaceKids on SPACE.com, you'll find big questions and answers about everything from the moon to Mars to our Milky Way.

Each day we highlight a spectacular picture from space. See space exploration photos, astronaut pictures and more in our Image of the Day galleries.

The eighth planet is an ice giant.

The gas giant is the third-largest planet.