A small planetary body in orbit around the Sun, larger than a meteoroid but smaller than a planet. Most asteroids can be found in a belt between the orbits of Mars and Jupiter. The orbits of some asteroids take them close to the Sun, which also takes them across the paths of the planets.
NASA Mars Rover and Helicopter models to go on national tour
Catch Mars mania as a traveling exhibit visits more than a dozen towns across the U.S. with lifelike models of...
