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BBC
By way of comparison, the asteroid which struck the Yucatan peninsula, causing the extinction of the dinosaurs 65 million years ago, is believed to have been 20-40 kilometers wide.
An asteroid discovered just weeks ago has become the most threatening object yet detected in space.
A preliminary orbit suggests that 2002 NT7 is on an impact course with Earth and could strike the planet on 1 February, 2019 - although the uncertainties are large.
Astronomers have given the object a rating on the so-called Palermo technical scale of threat of 0.06, making NT7 the first object to be given a positive value.
From its brightness, astronomers estimate it is about two kilometres wide, large enough to cause continent-wide devastation on Earth.
By way of comparison, the asteroid which struck the Yucatan peninsula, causing the extinction of the dinosaurs 65 million years ago, is believed to have been 20-40 kilometers wide.