posted on Aug, 14 2011 @ 10:00 PM
Another thing to understand about gravity, is it never disappears, but does sharply decrease with distance. Stars are very far apart. The sun is
believed to influence small bodies a light year away, the Oort cloud, and in the lack of a greater gravitational pull bodies will be influenced by the
sun if nothing closer with some measurable mass has a greater influence.
The earth actually gets a bit of a tidal tug from Jupiter each year the two planets are the closest, the tug however amounts to just 1% of the tidal
tug our moon has on earth. I had the figures but out of memory, all of the planets in our solar system combined would have 1.7% the tidal tug of our
moon, should they ever all be aligned as such. With that in mind one can clearly see that a tiny comet would have near zero gravitational effect on
earth, being a millionth the mass of the moon on average, no matter how close they come.