Russian scientists have warned that a major asteroid will hit the earth in 2036.
The asteroid, known as Apophis, is larger than two football fields. Russian scientists believe the huge rock will pass near earth in 2029 and will strike the planet on April 13, 2036.
They expect the giant space rock will pass through what's known as a gravity keyhole and change its course to hit Earth.
U.S. scientists don't agree with their Russian colleagues. They said there's only a 1-in-250,000 chance of impact.
In 2004, NASA scientists announced there was a possiblity that the asteroid could collide with Earth in 2029. However, that prediction was ruled out as the chances of collision were deemed slim to none.
"The situation is that in 2029, April 13, Apophis flies very close to the Earth, within five Earth radii, so that will be quite an event, but we've already ruled out the possibility of it hitting at that time," Donald Yeomans, head of NASA's Near-Earth Object Program Office, told Life's Little Mysteries.
"On the other hand, if it goes through what we call a keyhole during that close Earth approach…then it will indeed be perturbed just right so that it will come back and smack Earth on April 13, 2036," Yeomans said.