How were the planets formed?

by | Aug 4, 2009 12:30 PM ET

You Asked:

How were the planets formed? --- Erin, Gilbert, Ariz.

Marshall Brain Answered:

The current thinking is that: 1) A star exploded and created a cloud of dust, 2) gravity started pulling the dust particles together, 3) planets arose from a disk of dust that surrounded the sun, as described here:

But, as the following video discusses, it is not yet completely clear how these particles always stuck together:

Science still has a way to go before the planet-formation process is completely understood.

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