Russia objects. But the United States says the system would protect Europe from a possible attack by Iran.

VOA: special.2009.05.23

Some scientists have called Jupiter the protector of the inner planets and our own Earth -- from objects from the outer solar system.

VOA: special.2009.08.25

The exhibit shows detailed and colorful images of solar system objects including Mars.

VOA: special.2010.07.28

Reports of solar system objects striking each other are extremely rare.

VOA: special.2009.08.25

NASA hopes that Dawn's year long orbit around Vesta will help scientists learn more about the development of the solar system, and how asteroids and other space objects were created.

VOA: special.2011.07.27