Comet
A true-color image of Comet NEAT

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   →