0 one of many large rocks that circle the sun
1 an object like a very large rock that goes around the sun like a planet:
A one-kilometer wide asteroid could hold hundreds of billions of dollars worth of these minerals.
And on the asteroid Eros, there is more silver, gold, and aluminum than could ever be dug from the earth.
Asteroids contain minerals, such as nickel, cobalt, and even platinum.
The Outer Space Treaty covers the Moon, asteroids, and everything else in outer space.
Thousands of asteroids pass near Earth every year, and scientists believe those asteroids could be very valuable.
To mine an asteroid, you must take everything you need with you into space: equipment, people, food, and water.
The mechanical energy administered to a planetary surface by the impact of a comet or asteroid is another source of deformation.
