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7 asteroid impacts on Earth

By: Katherine Butler on Nov. 25, 2012, 12:07 p.m.
false color image of Manicouagan Crater


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Manicouagan Crater, Canada

This crater in Quebec, Canada, is known to be one of the oldest and largest impact craters on the planet. Experts believe it was created some 214 million years ago during the Triassic Period. Glaciers have since played a large part in its erosion.

This false-color image shows a green ring depression that surrounds a central peak. The ring depression contains the Manicouagan Reservoir. NASA calls this impact crater the easiest to spot from space. When astronauts are observing it from space, it looks like a ring lake and is "and as a smooth and flat feature in this topographic visualization."