What's a frozen ball of dust?
Generally speaking, a comet is a frozen ball (of water, carbon dioxide, ammonia and other organic carbon compound ices) hurtling through space. As these substances stream off the comet they form a spectacular gas and dust cloud of enormous length that can often be seen from earth with the naked eye.
What is often called a dirty snowball?
Comets are several miles in diameter, composed of rock, ice and other organic compounds, making them "dirty snowballs" in space, according to NASA's near earth object program. They originate outside the orbit of the outermost planets and form elliptical orbits that pass close to the sun.
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