Asteroids: Fun Facts And Information About Asteroids Asteroids And Earth

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April 12, 2020

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OSIRIS clear sieve image taken during the flyby of the Rosetta spaceship at asteroid Lutetia on July 10, 2010.

(Image: © © ESA 2010 MPS/OSIRIS Team MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA)

Asteroids are rocky worlds revolving around the sun that are too small to be called planets. They are also known as planetoids or minor planets. There are millions of asteroids, ranging within size from hundreds of miles to several feet across. In total, the mass of all the asteroids is less than that of Earth's moon. 

Despite their size, asteroids can be dangerous. Many have hit Earth within the past, and more will crash into our planet within the future. That's one reason scientists study asteroids and are eager to learn more about their numbers, orbits and physical characteristics. If an asteroid is headed our way, we want to have knowledge of that.

Formation

Asteroids are leftovers from the formation of our