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. For more details, click <a target="_blank" href="http://news.bbc.co.uk/1/hi/sci/tech/2147879.stm">here</a> and hold onto your hats!