A space rock the size of a skyscraper that scientists deemed “potentially hazardous” sailed harmlessly past Earth today (April 1) around 4:35 p.m. ET.

Even though the asteroid only flew within roughly 4.6 million miles (7.4 million km) of Earth (or  — about 30 times the average distance between Earth and the moon), this was still the rock’s closest approach to our planet since the asteroid’s discovery in 2007, according to SpaceReference.org, a database that compiles information from NASA’s Jet Propulsion Laboratory in California and the International Astronomical Union.


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