Doomsday Scenarios

Author and astronomer, David Darling, shares a series of images which showcase the various catastrophes which could doom the planet.

1) Could a destructive asteroid fall from the sky without any warning?

2) What's a galactic alignment and could it spell doom for us?

3) As the Sun approaches a peak of activity in 2013, is human civilization at risk?

4) What are the chances of hostile aliens invading the Earth?

5) Is it possible that the whole universe – including ourselves – is just a simulation inside some incredibly powerful computer?