The Outer Planets
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Asteroids Asteroids are small, rocky bodies that orbit the Sun much like planets, but are much smaller than planets. In fact, while comets are the size of a typical city, asteroids are about the size of a typical US state. Most asteroids are found in the asteroid belt. Learn more ->
Sections:

General Characteristics of Asteroids
Measuring Asteroid Properties
Origin and Evolution of Asteroids
Missions to Asteroids
Related links
Meteorites Primitive meteorites are remnants of the solar nebula, containing intermixed rock and metal flakes. Processed meteorites are fragments of larger asteroids and therefore can be metallic like a planet's core or rocky like its mantle or crust. Learn more ->
Sections:

Identifying Meteoites
Primitive Meteorites
Processed Meteorites
Dust and Plasma The dust in our solar system is created by collisions between comets, asteroids, and meteorites. Plasma is an ionized gas that serves many different purposes on Earth, as well as in the interplanetary medium. Learn more ->
Sections:

Interplanetary Dust
How is it distributed?
Why do we care about dust?
What's the dust made of?
Missions mapping dust
Plasma
Plasma in the interplanetary medium