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...
Everyone knows that eight planets orbit the Sun. But thousands of other objects, including icy comets and football field-sized asteroids, are also zooming around our...
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...