For more videos, go to www.discoverynews.com. With thousands of asteroids, comets and other near-Earth object buzzing by our planet, Jorge Ribas finds out how we...
Just about every two years, the planet Mars makes its closest approach to Earth... around 36 million miles. That's when we pack our robotic emissaries...
A group of scientists who were once mocked for their 'end of the world' asteroid explosion beliefs are given new respect by the astronomical community...
