A massive asteroid almost the size of 's iconic clock tower Big Ben will come within 107,500 miles (173,000 km) of Earth on Saturday - twice as close as the moon, which orbits at an average distance of 238,855 miles (384,400 km).The space rock, dubbed '2023 DZ2', is currently estimated to be , while Big Ben stands at 315 feet (96 m).It is also three times as large as the Chelyabinsk asteroid that struck Russia in 2013, which sent a shockwave twice around the globe.
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