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Asteroids have pretty much been mapped. We're relative sure we're safe from them.
The thing with comets is they come at us from the Kuiper Belt and Ord Cloud... beyond the outer planets at the rim our our solar system with irregular orbits...
So, it's always a "thing" that we could get hit by a comet at any given time without very much warning... it's nothing "new" per se, just understood as one of the fewer unknowns as we learn more about our solar system.
But we've been under that threat since the dawn of life on Earth, so, even though it might make for good t.v., not really worth worrying over, I think.
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-D.
ICQ: 202-96-31
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