asteroid

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

1
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)
2
adj
shaped like a star
FULL DEFINITIONS OF: asteroid
1

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)

Examples:
show 4 examples...
hide 4 examples...
Apollo asteroid
an asteroid whose orbit crosses the Earth's orbit
Ceres
the largest asteroid and the first discovered
Pallas
a large asteroid; the second asteroid to be discovered
Vesta
the brightest asteroid but the fourth to be discovered
Types:
Chiron
an asteroid discovered in 1977; it is unique in having an orbit lying mainly between the orbits of Saturn and Uranus
Type of:
minor planet, planetoid
any of numerous small celestial bodies that move around the sun
2

adj shaped like a star

Synonyms:
star-shaped
angular, angulate
having angles or an angular shape
WORD FAMILY
USAGE EXAMPLES