Asteroid

 Asteroid

plural noun: asteroids

1.

a small rocky body orbiting the sun. Large numbers of these, ranging in size from nearly 600 miles (1,000 km) across (Ceres) to dust particles, are found (as the asteroid belt ) especially between the orbits of Mars and Jupiter, though some have more eccentric orbits, and a few pass close to the earth or enter the atmosphere as meteors.

2.

Zoology

an echinoderm of the class Asteroidea, which comprises the starfishes.

adjective

Zoology

adjective: asteroid

relating to or denoting echinoderms of the class Asteroidea.

 

 Asteroids are small, rocky objects that orbit the Sun. Although asteroids orbit the Sun like planets, they are much smaller than planets. Asteroids are small, rocky objects that orbit the sun.

 

Asteroids are made mostly of rock—with some composed of clay and silicate—and different metals, mostly nickel and iron. But other materials have been found in asteroids, as well.

 

Millions of asteroids exist, many are shattered remnants of planetesimals, bodies within the young Sun's solar nebula that never grew large enough to become planets.



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