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Comet
A comet's tail always points away from the sun. Image Credit: NASA
a small object made up of ice, dust and gas that orbits the sun. Jets of gas and dust form long tails that can be seen from Earth.Sentences:
NASA sent the Deep Impact spacecraft to crash into a comet and study what it is made of.
Comets are sometimes called "dirty snowballs" because of what they are made of.
More Information:
http://spaceplace.jpl.nasa.gov/en/kids/deepimpact/index.shtml →
http://starchild.gsfc.nasa.gov/docs/StarChild/solar_system_level1/comets.html →
http://sse.jpl.nasa.gov/planets/profile.cfm?Object=Comets&Display=Kids →