Scientists will use a radar to study the 2012 DA14 asteroid, as it flies past the Earth tonight, to learn about its structure and composition.
They hope to use the information to help them plan in the event of another incoming space rock.
Video source: NASA
Scientists are looking at ways to 'nudge' an asteroid if it was a threat to Earth, as blowing it up would only result in debris falling to Earth, they said.
Tonight an asteroid will approach Earth, passing closer than ever before.
More top news
Temperatures have already plunged to -12C in some parts of the UK this winter - but Thursday could be the coldest day yet.
The 86-year-old has been removed from his position as CEO of Formula One as US giant Liberty Media completed its £6 billion takeover.
Donald Trump's press secretary has said the Trump administration's "intention is never to lie to you", amid a row about inauguration crowds.