Tag: radar astronomy
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Asteroid moon: moonsteroid!
Today, a relatively large asteroid known as 1998 QE2 will pass Earth, beyond the orbit of the Moon. Yes, it’s named for the cruise ship, but it’s much bigger — 2.7 kilometers along its greatest axis — and correspondingly much more massive. (As I said, the asteroid won’t come even as close as the Moon,…
Galileo's Pendulum 