Yeah but the real problem is spotting it in time. The sky is *really* big. | Hacker News

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		zaphar on April 25, 2010 \| parent \| context \| favorite \| on: Don’t talk to aliens, warns Stephen Hawking Yeah but the real problem is spotting it in time. The sky is really big.

stcredzero on April 25, 2010 [–]

If the projectiles are relativistic, then warning could only be a few days or even a few hours ahead of time. Even relativistic impactors are unnecessary. Low albedo impactors coming in from angles far off the ecliptic would be exceedingly hard to spot.

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