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The average temperature of an asteroid is -100 degrees Fahrenheit. Asteroids are also known as minor planets that typically revolve around the sun. More »

www.reference.com Science Astronomy Comets & Asteroids

Asteroid composition varies based on the asteroid's origin. An asteroid can contain rock, metal, clay, silicate, nickel, iron and water. All asteroids are covered in regolith, which is a rocky rubble. Regolith is commonl... More »

www.reference.com Science Astronomy Comets & Asteroids

The term "doomsday asteroid" is usually applied to an asteroid that, if it impacted Earth, would cause sufficient destruction to significantly disrupt the balance of life and possibly cause major extinctions. Such an ast... More »

www.reference.com Science Astronomy Comets & Asteroids
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The term "doomsday asteroid" is usually applied to an asteroid that, if it impacted Earth, would cause sufficient destruction to significantly disrupt the balance of life and possibly cause major extinctions. Such an ast... More »

www.reference.com Science Astronomy Comets & Asteroids

Discovered in 2004, 99942 Apophis is an asteroid with an estimated diameter of about 1,066 feet. This near-Earth object was originally given a 2.7 percent chance of a collision with Earth in 2029. However, subsequent cal... More »

www.reference.com Science Astronomy Comets & Asteroids

Ceres is the biggest asteroid with a diameter of approximately 590 miles. It was discovered by Giuseppe Piazzi in 1801, though he considered it a planet. Ceres is spherical in shape and orbits the sun between Mars and Ju... More »

www.reference.com Science Astronomy Comets & Asteroids

The largest known asteroid by mass is 4 Vesta, which makes up about 9 percent of the mass of the entire asteroid belt. The asteroid 2 Pallas is slightly larger by volume, but it is less massive than 4 Vesta. More »

www.reference.com Science Astronomy Comets & Asteroids