History of the Universe eBook. 398 pages, 300 illustrations only $2.99
and boil off the surface of , like the , and stream out past any nearby , such as the .
Here they meet the , and are forced by it to move to the poles. When they get down to the they the gases, which then emit . This is the source of the aurorae.
When the solar wind meets a , it pushes the gases which the comet releases away from the star, so creating the cometís tail.
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