Asteroid

A small, irregularly shaped object made of metal (iron and nickel), rocky materials, or a combination of the two that orbits the Sun or another planet. Most of the asteroids orbit in a broad band between the orbits of Mars and Jupiter. The largest is Ceres, which is about 600 miles (900 km) in diameter.

Radio Programs

Dawn at Vesta III An asteroid with a difference Friday, July 15, 2011
Dawn at Vesta II A gentle ride to an asteroid Thursday, July 14, 2011
Close Encounter A neighbor pays Earth a close visit Wednesday, June 1, 2011
Irene Discovering a "peaceful" planetoid Thursday, May 19, 2011
Lutetia Ready to map an asteroid Tuesday, May 3, 2011
Ready for Vesta Ready to map a giant asteroid Monday, May 2, 2011
Taking Inventory II Watching for invaders from beyond Sunday, March 27, 2011
Taking Inventory Taking inventory of the solar system Saturday, March 26, 2011
NEAR Encounter A close encounter with an asteroid Saturday, February 12, 2011
Vulcanoid Zone Searching the "vulcanoid zone" Wednesday, December 15, 2010
Geminid Meteors The meteoric fate of a meteor parent Monday, December 13, 2010
Asteroid Touchdown Picking up bits of an asteroid Saturday, November 20, 2010
Close Targets Grabbing a lingering visitor Friday, November 19, 2010
Target Hunting Hunting targets for future explorers Thursday, November 18, 2010
Nuke 'Em! The ultimate planetary protection Friday, September 3, 2010
Asteroid Thruster Getting a push from day and night Thursday, September 2, 2010
Hanging On Worlds that aren't clingy Wednesday, September 1, 2010
Spacewatch Keeping watch for space invaders Tuesday, August 31, 2010
NEAR
Dodging a Bullet
Asteroid 2008 TC3
Vulcanoids

Featured Images

The path of asteroid 2011 MD as it passes Earth, June 2011
 Close Call Saturday, June 25, 2011
Impact! Wednesday, February 3, 2010
Jovian Smash-up Monday, July 27, 2009

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