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But those boulders would burn up, unless you mean that's how big they'd be once they got through the atmosphere. Anyway, all this asteroid talk is starting to get to my head. People are starting to talk abut an asteroid with a tiny chance of hitting Earth in 17 years like the world is ending next Tuesday. Not that we shouldn't pay attention, but to astronamers if an asteroid has a 1 in 1,000 chance of hitting, it's doomsday. Anyway, I bet we'd discover some form of asteroid deflection very soon and get it built a heck of a lot faster than the pessimistic, doomsaying scientists say if it were funded.

Actually, I believe house size chunks of a larger asteroid would have no trouble surviving our atmosphere and impacting the earth. Again, If an asteroid the size of a house entered the atmosphere, it would definitely strike the earth, causing an unbelievable explosion, and completely destroy a major city if it happened to fall on one.

And I also think astronomers would be the last ones to yell doomsday! They generally stick to facts and understand that actually getting hit by a sizable asteriod is very remote.