|MadSci Network: Astronomy|
When talking to students, subject was about starting an object in motion in space, and that it would continue until another force acted on it. For example, an astronaut pushes something and off it goes. Later we were discussing orbits and that the gravitational force of the sun balances with the forward force of the planets motion to keep them in orbit. These two ideas seem contradictory. If the suns gravity can reach out an hold jupiter in orbit, shouldn't an object moving through space be acted on by gravity? Or as another example, If an object was released in space and was totally motionless, wouldn't the sun (being the strongest gravity effecting it) start it moving toward the center of the solar system.
Re: How does gravity in space effect motion?
Try the links in the MadSci Library for more information on Astronomy.