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http://www.bbc.co.uk/news/science-environment-41583704
An asteroid the size of a house is passing close to Earth.
The space rock will hurtle past our planet at a distance of about 42,000km (26,000 miles), bringing it within the Moon's orbit and just above the altitude of communication satellites.
Nasa scientists say there is no risk of an impact, but the flyby does provide them with the opportunity to test their asteroid-warning systems.
A global network of telescopes will be closely monitoring the object.