Asteroid Defense: Detection is Key
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An asteroid just flew past Earth… inside the Moon’s orbit. So—how close is...
too close… and if one was headed for us… could we actually stop it? “First: ‘close’
doesn’t automatically mean ‘danger.’ Space is huge. What matters is two things: size
and odds. A pebble can hit us and burn up. A city-sized rock? Different story.”
We love saying ‘it passed near Earth’—but the real question is: could it hit later?
Astronomers flag objects that come near Earth’s orbit and are big enough to matter.
The scary part isn’t the one that misses by a few hundred thousand kilometers—it’s the one that threads
a tiny invisible lane called a gravitational keyhole. “Miss the keyhole today… and you’re
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