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NASA

Submission + - NASA counts 4,700 potentially hazardous near-Earth asteroids (networkworld.com) 1

coondoggie writes: "NASA continues to get a better handle on the asteroids buzzing around in space saying today that there are roughly 4,700 potentially hazardous asteroids, or as NASA calls them PHAs.
NASA says these PHAs are a subset of a larger group of near-Earth asteroids but have the closest orbits to Earth's – passing within five million miles (or about eight million kilometers) and are big enough to survive passing through Earth's atmosphere and cause damage on a regional, or greater, scale."

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NASA counts 4,700 potentially hazardous near-Earth asteroids

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