What did our solar system use to look like, long before the Earth and the planets were a thing? The answer lies in asteroids — little space rocks that still float around our neighborhood some 4.5 billion years after the sun formed. This year, two space missions arrived at their target asteroids, and they plan to pick up some precious samples to return back to Earth.
Related Video: How to Protect Earth From Space Rocks
Why Should You Care?
Watch the Chelyabinsk Meteor Fall
Written by Elizabeth Howell December 20, 2018
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