Comet warning: NASA admits ‘we’re not going to know’ when space rock flies at Earth

Dr Chesley said: “If we see something coming, first of all, we’re not even going to know because of outgassing whether or not it’s actually going to hit the Earth until very late, and then what do you do with something that’s six miles (10km) in size that’s probably headed for you?

“With current surveys, you would see it when it passes Jupiter, maybe Saturn, probably.

“So you would have a year or two of warning.

“That’s a kind of hazard that’s truly catastrophic for the globe, for the planet. You think dinosaur killer.

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