The whole premise of the article is that
we don't know how many NEOs are out there.
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Quote:
Experts admit they don't yet know how many so-called Near-Earth Objects (NEOs) orbit close enough to pose a threat.
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Quote:
"The good news is we have conducted the 'Spaceguard' survey, which has detected most of these very large objects," he said.
"We think we've detected all the NEOs big enough to cause a mass extinction and pretty much eliminated that risk."
Meanwhile smaller objects that can cause significant destruction are currently flying under the radar.
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and
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Quote:
"The main risk lies with those objects that we have not even found yet," the Space Science Institute's Harris said. "So the most important thing is to continue [surveillance]."
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So to say there's "
No Way", it could happen is quite wrong. In fact, it is the most likely thing to happen (that we won't see it coming), as any objects discovered and deemed dangerous would be dealt with. Also, "keyholes" only help us when we know about an asteroid (or comet) and can determine what the specific path it needs to take to be on a collision course.
Of course there's always the threat of some random comet coming out of nowhere that we've never seen before; they have been known to have highly eccentric orbits. Something of that nature could have a 100,000 (or however long outside of human history) year orbit and we'd have absolutely no record of them.
There's nowhere I can't reach.