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Like the hills and valleys on a contour map the gravity wells of suns, planets, moons, and planetesimals showed up.
As planetesimals grow still larger, their gravitational attraction increases, allowing them to become even more effective at accreting nearby planetesimals .
Although planets, moons and planetesimals may seem to be very different astronomically, their common origin shows that this is not so.
When the planets formed 4.6 billion years ago, they formed from an agglomeration of many planetesimals , or small solid celestial bodies.
Asteroids are small bodies in space - the numerous leftover planetesimals from which the planets were made nearly 4.6 billion years ago.
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