Earth is about to lose its second moon, forever


Earth’s second moon will make a close approach to the planet next week before drifting off into space, never to be seen again.

“What second moon,” you ask? Astronomers call it 2020 SO — a small object that dropped into Earth’s orbit about halfway between our planet and the moon in September 2020. Temporary satellites like these are known as minimoons, though calling it a moon is a bit deceptive in this case; in December 2020, NASA researchers learned that the object isn’t a space rock at all, but rather the remains of a 1960s rocket booster involved in the American Surveyor moon missions.

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