An asteroid the size of a bus will make the fourth closest approach to Earth on record this week.The space rock, known as 2023 BU, was only discovered by last weekend but is set to come within 2,100 miles (3,400 km) of our planet's surface this Friday (January 27) at about 00:30 GMT (19:30 ET on Thursday).Most asteroids pass beyond the distance of the moon – which is 240,000 miles away – but this one is far closer and will be the nearest for 300 years.
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