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Because comets are composed of ice and dust, they are often easily seen several months prior to their perihelion; usually around the distance of Mars or the asteroid belt, and sometimes further out than Jupiter is. A global network of amateur astronomers, searching nightly for comets, would almost certainly see any comets while still far out from the Earth. We could expect a minimum of 3 months warning, and possibly 9-12 months before it would hit the Earth.

So far, nothing that we have detected in space has more than one chance in several thousand of striking the Earth. That body, the asteroid "Apophis", will certainly miss the Earth on its first approach on Friday, April 13 2029, but Earth's gravity may distort its orbit so that Apophis has a SLIGHT chance of collision on its second encounter on Friday, April 13, 2036.

The fact that both dates are Friday the 13th is not lost on astronomers.

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Q: How soon would you know if a comet was going to hit the earth?
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When will the comet will hit the earth again?

We don't currently know when a comet will hit planet Earth.


How hard would a comet hit Mercury?

Hard. If you want more specific than that, you're going to need to know about the mass and speed of the comet.


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Dialga would know that answer.


How fast does a comet go?

It is too difficult to tell. There is no existing average for the velocity of comets, as all comets are different. Gravitional, solar and initial velocity have a lot to due with the velocity of a comet. Even though there is a great deal of variation, the answer would have to be very, very fast. Fast, that is, compared to earth standards. If a comet were to hit earth, for example, chances are that we wouldn't see or even know that it had hit. It would just hit. Not to scare you. The chances of a comet hitting the earth are slim to none.


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Probably because they were uninformed. Science has come a long way since then and we know Haleys Comet will probably never collide with Earth and end all life.


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If a comet is close to the sun how fast does it travel?

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What comes after Venus?

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What will the comet in 2013 do to the earth?

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