Massive asteroid up to twice the size of Big Ben to enter Earth's orbit in days

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Daily Star's biggest headlines straight to your inbox!A massive asteroid up to twice the size of Big Ben will enter the Earth’s orbit this week.NASA is tracking the space rock, dubbed 2021 PT, which will make its approach on Sunday, August 29.It has a diameter of 110m – 240m, while Big Ben stands at just 96m.It is travelling at a speed of more than 16,000 mph, but will pass by the Earth at a distance of more than three million miles.For comparison, the moon is 238,855 miles away from us.It is classed as an Apollo asteroid, “near-Earth asteroid orbits which cross the Earth's orbit similar to that of 1862 Apollo”.Another asteroid being tracked by NASA is 2011 UC292.It has a smaller diameter of 73m – 160m , but is travelling at a quicker speed.