Two tiny asteroids sneaked safely past Earth last weekend, only to be discovered hours after they'd buzzed our planet. 2018 NX and 2018 NW zipped past our blue-green orb at distances of just 72,000 miles and 76,000 miles, respectively. That's about one-third of the distance from Earth to the moon.
Scientists think the asteroids both stretched between about 16 and 50 feet in diameter. That's relatively small for near-Earth asteroids.
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