How does a comet change when it comes close to the sun

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.

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