25, March 2015
**Mass: Varies, larger than meteoroids; all asteroids together have about 4% of the mass of the moon.
**Distance from sun: 150 million kilometers
**Rotation Period [earth days]:it verys by asteroid Ida for example the asteroid takes 4.6 hours for a full rotation.
**Revolution Period [earth years]:A asteroid Ida for example takes 4.8 earth years to orbit around sun.
**Atmosphere[principle Gases]:asteroids have no atmosphere
**Composition: mostly made of metal and rock
*** A few interesting facts:
*An asteroid may be grouped together in the 'belt' between Mars and Jupiter; can move outside of the asteroid belt.
*Asteroid Belts were 1st discovered in 1801.
*Asteroid Belts are in between the outer and inner planets.
*Asteroids were formed from a planet trying to form but the formation failed.