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...
ANU Public lecture: Target earth: the asteroid impact history of Australia - Dr Andrew Glikson. This video was recorded at The Australian National University on...
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...