Anthony,
Exactly, yes; the HEAD of a comet, the so-called "nucleus" can be
1 km or 10 km across. Big as Manhattan Island, on the large side.
You don't want to be hit by that, anywhere on earth. The tail is
pretty: the head is not! It is like a hammer.
The energy of collision would be like that of tens of millions of (rather
large) hydrogen thermo-nuclear bombs. Note that energy goes
as the velocity (of impact) SQUARED. That's a big factor, as velocity
goes up, say. But no impact would be safe, because Cosmical velocities
are always quite high. That's life. ;-)
--Joe
> Anthony Wu <wuasg@...> wrote:
>
> Joe,
> I remember the tail of some comet did enter the earth, but you saw only
> meteorite rains in the sky.
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