A massive shockwave, much like the aftershock of a nuclear explosion, will sweep across the globe. A wall of fire will roast every living thing on Earth -- well, except a few fish, that is. The Gamma Ray Burst will reset evolution.

Even a blast occurring farther out in the Milky Way won't be good for our health. OK, so the burst is too far away to fry us. But still, it will mess up our atmosphere. The energetic gamma rays will grind up the molecules our atmosphere is made of into separate molecules of nitrogen and oxygen. These atoms in turn will mop up the ozone layer, leaving us exposed to the deadly UV radiation from the Sun.

Shutter to think. That makes me think about astroids and their potential for devastating mother Earth.

Oh, Just take a look at the source-