An asteroid is a large, irregularly shaped object in space that orbits our Sun. If one of these giant rocks ends up on a collision course with Earth, we are in for big trouble.
An asteroid is like a comet. However, while comets are mostly made of ice, asteroids are made up of rock or even metal. This makes them dangerous because they can cause a lot of damage if they collide with a planet. The craters on the Moon were formed by asteroids and some think it was an asteroid that wiped out the dinosaurs. Around a million asteroids are located between Mars and Jupiter in an area called the “asteroid belt.”
Primary Meanings of asteroid
any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)
shaped like a star
n any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)
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an asteroid whose orbit crosses the Earth's orbit
the largest asteroid and the first discovered
a large asteroid; the second asteroid to be discovered
the brightest asteroid but the fourth to be discovered
an asteroid discovered in 1977; it is unique in having an orbit lying mainly between the orbits of Saturn and Uranus