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
The way the government plans to pay for social housing tenants to buy their homes is "extremely questionable", MPs warn.
Marco Rubio was the man who was going to ride to the Republican party's rescue. What went wrong?
ITV News asked a few of Donald Trump's fans what message his victory in the New Hampshire Republican primary sends to the world.