Asteroids, Comets and Other Small Objects Provide Clues of Mysterious Distant Past

Why We Care About Space Rocks

The small worlds of our solar system help us trace its history and evolution, including comets. This video clip was compiled from images taken by NASA’s EPOXI mission spacecraft during its flyby of comet Hartley 2 on Nov. 4, 2010. Credits: NASA/JPL-Caltech/UMD

The entire history of human existence is a tiny blip in our solar system’s 4.5-billion-year history. No one was around to see planets forming and undergoing dramatic changes before settling in their present configuration. In order…


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