Register to reply

Pull of Gravity.Where it starts?

by gunblaze
Tags: gravitywhere, pull, starts
Share this thread:
gunblaze
#1
Jul7-04, 01:38 AM
P: 186
hi...

Juz curious... when does the gravitational pull of earth starts?

eg:
Let's say a comet/ a space rock ...It will travel slowly in space but once it is caught by gravity, it will accelerate, right? Yeah... so when does that happen.What distance from earth will the earth's gravitational force starts to act on the subject.
Phys.Org News Partner Astronomy news on Phys.org
Magnetar discovered close to supernova remnant Kesteven 79
Image: Hubble looks at light and dark in the universe
Mixing in star-forming clouds explains why sibling stars look alike
techwonder
#2
Jul7-04, 02:43 AM
P: 51
Infinitely far away, because the force between the bodies is GMm/(r*r). If your question was meant to be when the force between Earth and the comet is the dominant gravitational force, well that's an entirely different question.
Chronos
#3
Jul7-04, 05:35 AM
Sci Advisor
PF Gold
Chronos's Avatar
P: 9,454
Well, technically, the affect of earths gravity field is only observable out to a distance of about 2.75 billion light years.

Mike2
#4
Jul7-04, 07:18 AM
P: 1,308
Pull of Gravity.Where it starts?

Would quantum mechanics dictate a zero-point minimum gravity? Does the graviton have a minimum energy level so that there is a mimimum gravity force?


Register to reply

Related Discussions
Where does quantum gravity starts ? Special & General Relativity 16
Gravity working as botha push and a pull General Physics 0
Gravity: push, pull, or does not exist? General Physics 339
Does gravity pull towards the 4th dimension? Beyond the Standard Model 0