An asteroid the size of a football field barely missed Earth in a surprise flyby

A rendering of an asteroid.
(Image credit: iStockphoto)

In space, an asteroid that comes within 120,000 miles of Earth is considered a close call.

So we should feel lucky that a flying boulder whizzed past us Sunday without incident, especially considering that scientists didn't see the massive rock coming until the last minute. The asteroid, named 2018 GE3, was the size of a football field, measuring about up to 361 feet in diameter.

Because asteroids are relatively small and dark, LiveScience reports, it can be hard to predict when one will approach our planet — which is a fairly rare occurrence anyway. This most recent asteroid passed at half the moon's distance from Earth — about 119,500 miles — but the Catalina Sky Survey didn't spot it until a few hours before because the massive rock reflected so little light.

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Telescopes used by NASA are generally on the lookout for much larger and potentially extremely dangerous flying objects, reports LiveScience, so it's easy for skywatchers to miss smaller asteroids that would have only a, say, mildly devastating effect on impact. So rest assured: If a truly enormous asteroid were on its way to slam into Earth, NASA would let you know.

In fact, you can mark your calendar now: An asteroid 10 times the size of 2018 GE3 is coming our way, and will approach our planet in 2036.

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Summer Meza, The Week US

Summer Meza has worked at The Week since 2018, serving as a staff writer, a news writer and currently the deputy editor. As a proud news generalist, she edits everything from political punditry and science news to personal finance advice and film reviews. Summer has previously written for Newsweek and the Seattle Post-Intelligencer, covering national politics, transportation and the cannabis industry.