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en.wikipedia.org/wiki/Asteroid

Asteroids are minor planets, especially those of the inner Solar System. The larger ones have .... The term "asteroid", from the Greek word for "star-like", never had a formal definition, with the broader term minor planet being preferred by the  ...

www.vocabulary.com/dictionary/asteroid

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 ...

www.merriam-webster.com/dictionary/asteroid

Define asteroid: any of the small rocky celestial bodies found especially between the orbits of Mars and Jupiter; starfish — asteroid in a sentence.

www.dictionary.com/browse/asteroid

Asteroid definition, Also called minor planet. Astronomy. any of the thousands of small bodies of from 480 miles (775 km) to less than one mile (1.6 km) in ...

spaceplace.nasa.gov/asteroid

Nov 17, 2016 ... Asteroids are small, rocky objects that orbit the sun. Although asteroids orbit the sun like planets, they are much smaller than planets.

www.nasa.gov/audience/forstudents/k-4/dictionary/Asteroid.html

Thousands of asteroids are in orbit around the sun. ... Sentences: NASA's Dawn spacecraft studies asteroids. Thousands ... Return to NASA's Picture Dictionary.

www.collinsdictionary.com/us/dictionary/english/asteroid

Asteroid definition: An asteroid is one of the very small planets that move around the sun between Mars and... | Meaning, pronunciation, translations and ...

www.yourdictionary.com/asteroid

The definition of an asteroid is a rocky mass that orbits the sun. Facts About Astroids. More than 1,800 asteroids have been identifed in the solar system.

www.space.com/51-asteroids-formation-discovery-and-exploration.html

Sep 20, 2017 ... Asteroids are small, airless rocky worlds that revolve around the sun and ... Earth's atmosphere, which means that even if 2015 TC25 hit Earth, ...