Would it crash into Earth? Not really, that is what the experts are saying. This asteroid that is the size of an Olympic swimming pool will cross Earth at a distance of 28,000 kilometres. No other object that size has ever gotten so close to Earth.

It will be moving at a very fast speed of 7.8 kilometres a second.

If you look up in the night sky you may even see it and if you miss it you can catch it on NASA web will also stream live pictures of the event on the internet.