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en.wikipedia.org/wiki/Comet

A comet is an icy small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing. This produces  ...

www.qrg.northwestern.edu/projects/vss/docs/space-environment/1-what-is-a-comet.html

Comets are often referred to as "dirty snowballs." They are left over from the formation of stars and planets billions of years ago. Before zipping around the Sun ...

coolcosmos.ipac.caltech.edu/ask/178-What-is-a-comet-

Comets are basically dusty snowballs which orbit the Sun. They are made of ices, such as water, carbon dioxide, ammonia and methane, mixed with dust.

cse.ssl.berkeley.edu/SegwayEd/lessons/findplanets/find_comet/WhatsAcomet.html

Sep 26, 1996 ... What's A Comet? A comet is a small body in our solar system that orbits the Sun much as do the Earth and the planets, except that comets ...

www.planetsforkids.org/what-is-a-comet.html

What is a comet? A comet is basically a big ball of ice and rock. Where do they come from? They are leftovers from the beginning of the solar system. Why dose  ...

solarsystem.nasa.gov/planets/comets/basic

Comets are big chunks of ice, rock and gas. They are dirty snowballs of leftovers from the beginning of our solar system. Comets get their name from the Greek ...

spaceplace.nasa.gov/comet-nucleus/en

A comet's nucleus, or heart, is the solid chunk of something in the center of its fuzzy coma. As it approaches the Sun, some of its surface boils off and creates a  ...

www.skyandtelescope.com/astronomy-resources/what-is-a-comet

Jul 15, 2014 ... Just what is a comet, exactly? Comets, the solar system's dirty snowballs, are suspected to be one of the remnants of planet formation.

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

NASA sent the Deep Impact spacecraft to crash into a comet and study what it is made of.