Where do comets come from?

CometComets come from two major areas of our solar system: the Kuiper (which is pronounced KY-per) Belt and the Oort (pronounced OR-t) Cloud. Each of these two regions contains billions of comets, but they have so much room in these vast rooms of space that they get no closer to each other than we on Earth do to the sun.

The Kuiper Belt is about two billion miles wide (3.2 billion km); it begins just past Neptune’s orbit, which is about three billion miles (4.8 billion km) from the sun, and stretches to about five billion miles (eight billion km) from the sun.

The Oort Cloud is way out there, at the extreme edge of our solar system – about 18 trillion miles (30 trillion km) beyond the sun.


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