UK Daily Mail 
Feb 11, 2011
An asteroid travelling at 23,000mph could crash into Earth on April 13, 2036 killing millions and causing global chaos, scientists claim.
In a plot line taken straight from a science-fiction film, astronomers in Russia are predicting that the 300-yard-wide Apophis will slam into the planet in 25 years’ time.
But don’t panic just yet, as it is extremely unlikely to happen.
So unlikely, in fact, that Nasa has given the catastrophic event odds of 250,000-to-one that it actually takes place.
First, the comet must pass through a narrow gravitational keyhole – a small region in space that alters the course of a passing asteroid due to Earth’s gravity – in April 2029 before it can be on course to collide seven years later.
The force of Earth’s gravity is so great that if the asteroid goes through the hole its path could be ‘tweaked’ – sending it straight towards us.