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Large asteroid to pass by earth

An asteroid that is 400m (1,300ft) wide will pass by the Earth on Tuesday, closer to it even than the Moon.

It poses no danger to the Earth and it will be invisible to the naked eye.

Asteroid 2005 YU55's closest approach, at a distance of 325,000km (202,000mi), will be at 23:28 GMT. It is the closest the asteroid has been in 200 years.

It is also the largest space rock fly-by the Earth has seen since 1976; the next visit by such a large asteroid will be in 2028.

Lindley Johnson from the Nasa Near Earth Object Observation has been watching this asteroid for five years and says there is nothing to worry about.