The 3 Biggest Space Impacts Ever

Celebrate Asteroid Day by learning about the 3 biggest collisions that Earth has experienced with celestial objects.
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Sources:
http://www.livescience.com/50227-bigg...
http://www.sciencedirect.com/science/...
http://www.livescience.com/45172-vred...
http://news.nationalgeographic.com/ne...
http://science.nasa.gov/science-news/...
http://www.livescience.com/48793-sudb...
http://www.nature.com/news/rock-sampl...

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