Imagine that the Sun is on the verge of exploding. Or that a planet-killing asteroid is headed our way. Or maybe you just ...

Add Yahoo as a preferred source to see more of our stories on Google. My hypothesis is that remnants of a supernova – an exploding star – had an impact on the Earth’s past climate, causing global ...

Rocks from outer space are constantly hurtling toward Earth, slamming into the atmosphere and often exploding into fireballs ...