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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

Mar 16, 2017 ... On the other hand, the smallest asteroid ever studied is the 6-foot-wide (2 meters) space rock 2015 TC25, which was observed when it made a ...

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

Piazzi made history's first asteroid discovery. He named it after the Roman goddess for agriculture: Ceres. While astronomers of Piazzi's era eventually ...

solarsystem.nasa.gov/docs/Comet_factsheet_4-25-12_b.pdf

Composed of rock and metals. Surface is solid and stable, showing craters where other objects have crashed into it. Surface does not boil off, thus no coma.

spaceplace.nasa.gov/asteroid/en

Nov 17, 2016 ... Asteroids are small, rocky objects that orbit the sun. ... Most asteroids are made of different kinds of rocks, but some have clays or metals, such ...

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

There are three main kinds of asteroids, made up of rock, or metal, or a mixture of the two. The rocky ones, known as carbonaceous (C-types), are usually dark ...

www.telegraph.co.uk/science/2017/01/05/nasa-visit-mysterious-metal-asteroid-could-core-lost-planet

Jan 5, 2017 ... An artists impression of the Psyche spacecraft at the asteroid ... The strange chunk of metal, named 16 Psyche, is made of iron and nickel, ...

www.qrg.northwestern.edu/projects/vss/docs/space-environment/1-asteroid-planetiod-meteoroid.html

Asteroids are also known as "minor planets." They are made up of much of the same stuff as planets, but they are much smaller. The four largest known are ...