It loses mass. The comet speeds up, this is because higher gravity = higher speed, also the ices of water, methane, and ammonia vaporize because of the heat, this creates dust and jets of gases. These gases and the dust form a cloud called a com
A comet is like a giant dirty snowball, the size of a town or city. It is made of ice, dust, and small pieces of rock. As a comet gets closer to the Sun, it starts to melt. It becomes surrounded by lots of gas and dust.
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