ABCNews Asks Whether Sky is Indeed Falling

For thousands of years, different religions have warned Earth about Armageddon and the final days.

We are now living in an age where scientists are adding their voices and their evidence in support of end-of-the-world possibilities.

"Last Days on Earth" is a program that could change the way you see your world and yourself.

The world's top scientists, including Stephen Hawking, considered the foremost living theoretical physicist, describe seven riveting scenarios detailing the deadliest threats to humanity.