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en.wikipedia.org/wiki/Asteroid

Asteroids are minor planets, especially those of the inner Solar System. The larger ones have ... In the case of comets, the difference is one of composition: while asteroids are mainly composed of mineral and rock, comets are composed of dust ...

www.space.com/14749-asteroids-composition.html

Mar 1, 2012 ... This composite image shows the comparative sizes of eight asteroids. Until now, Lutetia, with a diameter of 81 miles (130 kilometers), was the ...

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

6 days ago ... Asteroids are small, airless rocky worlds that revolve around the sun and ... was observed when it made a close flyby of Earth in October 2015.

www.universetoday.com/37425/what-are-asteroids-made-of

Sep 12, 2015 ... All asteroids and comets visited by spacecraft as of November 2010 ... Asteroids are made mostly of rock — with some composed of clay and ...

www.nasa.gov/mission_pages/asteroids/overview/fastfacts.html

... at the South by Southwest Festival in Austin, Texas, NASA representatives discussed how citizen scientists have made a difference in asteroid hunting.

www.skyandtelescope.com/astronomy-resources/what-are-asteroids

Jul 15, 2014 ... Asteroids are rocky objects primarily found in the asteroid belt, a region ... made headline news in 2013, when the near-Earth asteroid dubbed ...

curious.astro.cornell.edu/physics/72-our-solar-system/comets-meteors-and-asteroids/asteroids/298-how-did-asteroids-form-and-what-is-the-difference-between-an-asteroid-and-a-comet-beginner

Jul 18, 2015 ... Can you please tell me how asteroids are formed and what is the ... They're made of ice, which would melt if it was as close to the Sun as the ...

research.arizona.edu/stories/what-is-an-asteroid

Jun 28, 2017 ... What are Asteroids Made Of? Scientists use the amount of metal elements to classify an asteroid. One with greater mass and gravity has more ...

www.factmonster.com/dk/encyclopedia/space/asteroids

An asteroid is a lump of rock that circles the Sun. Asteroids are also called minor planets. The biggest one, Ceres, is only 580 miles (930 km) across.