Scientists are warning of a possible asteroid collision with the Earth.
An asteroid around two-thirds of a mile wide (1.2km) could hit the earth on March 21, 2014 and has been classified as "an event meriting careful monitoring" by astronomers.
But they say the probability of the asteroid hitting Earth is just 1 in 900,000 and the risk of impact is likely to decrease as they collect more information.
The newly-discovered asteroid, known as 2003 QQ47, has a mass of around 2,600 million tons.
Its orbit calculations are currently based on just 51 observations during a seven-day period.
Dr Alan Fitzsimmons of Queen's University, Belfast, one of the expert team advising the UK NEO (Near Earth Objects) Information Centre, based in Leicester, said: "The NEO will be observable from Earth for the next two months, and astronomers will continue to track it over this period."
The giant rock was first observed on August 24 by Lincoln Near Earth Asteroid Research Program (LINEAR), based in Socorro, New Mexico.
The observations were reported to the Minor Planet Centre in Massachusetts, a centre for all new discoveries of asteroids and comets. The asteroid has been given a classification - known as a "Torino hazard rating" - of one, out of a possible 10, defining it as "an event meriting careful monitoring".
Scientists said it was likely to drop down the scale for hazard as more observations were made.
Kevin Yates, project manager for the UK NEO Information Centre, said: "As additional observations are made over the coming months, and the uncertainties decrease, asteroid 2003 QQ47 is likely to drop down the Torino scale.
A National park in the USA (california to be exaclt) has an active volcano in it. Infact the park has been shut down to visters due to scientists thinking it could be very soon it is a "very high possibility that i could errupt anytime soon". (remember soon could be several years) why is this story in the "life threatening news" section?... well its because it IS life threatening... like the film Deep impact (where an asteriod collides with earth.) this erruption will cause a Massive Tidle wave several hundered feet high and will wipe out anything in its path