VIDEO: Earlier today a meteorite exploded over Russia. Tonight an asteroid the size of an Olympic swimming pool will hurtle past the Earth at a speed getting on for 20,000 miles an hour. Simon investigates tonight's happening'.
The biggest meteorite ever discovered in Britain is going on display at a Wiltshire museum.
It's believed to be 30,000 years old and was discovered in the grounds of Lake House near Salisbury in 1908. It will be on display at the Salisbury and South Wiltshire Museum for two weeks.