No astronaut has ever stepped foot on Mars, but that doesn't mean humans haven't left their mark — literally. Since 1971 when the Soviet Union's Mars 2 spacecraft crash-landed onto the Red Planet, ...

Scientists fear the "Kessler Syndrome," a theoretical chain reaction where collisions create more debris, potentially ...

Sometimes, what goes up doesn’t come back down — instead, it becomes a problem. Junk is accumulating in space at a fantastic pace, millions of pieces orbit the Earth, from broken satellites to lost ...