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.

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.

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