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There are hardly any comets, meteorites or asteroids near earth. There are only a few that are millions of kilometers from earth. There are a few that pass earth a bit closer because of the asteroid belt between Mars and Jupiter.
Yes. It is heavier through the bombardment by meteors, asteroids, comets, and another planet (which led to the formation of the Moon).
There are comets around all the time. In order to have this much of a cataclysmic effect, it would need to pass very close to the earth, if not hit it entirely. At the moment, we do not know of any comets on this trajectory.
Comets have a very low mass compared to Earth, so any affect they will have on Earth is from impacts which will affect the global weather.
Yes! All the time. Although comets tend to have very elongated orbits which bring them close to the sun which slingshots them far out into space and back again. NASA's Jet Propulsion laboratory has a great site for tracking objects in our solar system. solarsystem.nasa.gov/eyes/
Yes
I don't think any COMETS have struck the earth, but METEORITES have. Comets are icy balls of gas and dust that fly around the sun like Halley's comet.
Nobody truly knows. It is likely that - as is the case for the Earth - any water was 'delivered' there by comets.
It doesn't pass through any US cities but it does pass through London, England.
Sound can pass through any state of matter.
An infinite number of lines can pass through any given point.
There are no visible comets at this time.