It's long been thought that a giant asteroid, which broke up long ago in the main asteroid belt between Mars and Jupiter, eventually made its way to Earth and led to the extinction of the dinosaurs. New studies say that the dinosaurs may have been facing extinction before the asteroid strike, and that mammals were already on the rise. Image credit: NASA/JPL-Caltech

How Long Does it Take to get to the Asteroid Belt?

Just how long would it take to get to the Asteroid Belt, in the event that we want to start sending spacecraft there on a regular basis?

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