The Asteroid Apophis is named after the Egyptian demonic serpent-spirit of destruction.
Approaching the earth tonight, scientists have been monitoring its movements to help predict its path in the future.
In 2029 it is expected to fly past the Earth at a distance of 30,000 km, with a one in 250,000 chance it could hit Earth in 2036.
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Five people were killed and dozens more were injured after a car and knife attack in the capital on Wednesday afternoon.
Among those expected to attend the ceremony will be former US President Bill Clinton and ex-Northern Ireland first minister Peter Robinson.
Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.