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Ancient Space Rubble
Asteroids are rocky fragments left over from the formation our the solar system about 4.6 billion years ago. Most of these chunks of space rubble, sometimes called minor planets, can be found orbiting the Sun in a belt between the orbits of Mars and Jupiter. The Asteroid Belt or Main Belt probably contains millions of asteroids.

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Mass
Metric: 8 x 1020 g kg

Additional Information:

Discovered in 1801, Ceres was the first asteroid discovered. It has since been reclassified as a dwarf planet because it is more like a planet that its neighbors in the main asteroid belt.

About once a year, an automobile-sized asteroid hits Earth's atmosphere, creates an impressive fireball, and burns up before reaching the surface.

Asteroids that populate the main asteroid belt between Mars and Jupiter, and pose no threat to Earth, can be as big as 940 km (about 583 miles) across.
Mass
Metric: 8 x 1020 g kg

Additional Information:

Discovered in 1801, Ceres was the first asteroid discovered. It has since been reclassified as a dwarf planet because it is more like a planet that its neighbors in the main asteroid belt.

About once a year, an automobile-sized asteroid hits Earth's atmosphere, creates an impressive fireball, and burns up before reaching the surface.

Asteroids that populate the main asteroid belt between Mars and Jupiter, and pose no threat to Earth, can be as big as 940 km (about 583 miles) across.