Diameter of a comet of Swift - Tattl as scientists have found out, approximately is four times more, than diameter of an asteroid which has destroyed dinosaurs sixty five million years ago.

"Now Swift's comet - Tattla is only a source of meteors for Perseid and doesn't represent danger to mankind, however in the future the situation can change. If my calculations are right, then approximately through two and a half thousand years the trajectory of a comet will change as a result of "gravitational blow" of Jupiter. And then she will begin to threaten our planet" — the astrophysicist Ethan Siegel from National aerospace agency of the USA tells.

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 This comet is far from us and doesn't threaten us. It is good)