posted on Aug, 15 2008 @ 07:42 AM
Originally posted by B3...
So gravity we feel and gravity between planets (where is no gravity) are two different effects?
[edit on 8/14/2008 by B3...]
There is plenty of gravity betwen the planets.
If I put you in a spaceship right between the orbits of Earth and Mars, the Sun's gravity would begin to make you fall toward the Sun, just like
jumping from a tree on Earth would cause you to fall toward the Earth.
An important thing to realize is that an "orbit" is caused by gravity. Things in orbit are not floating free of gravity, but rather are "falling"
toward the thing they are orbiting: The space station is "falling" toward the Earth and the Earth is "falling" toward the Sun. However, the
space station and Earth (and everything else in an orbit) also have a motion "sideways" relative to the surface of the thing they are orbiting, so
the don't hit the surface.
An orbit is caused by gravity, so the answer to your question "What pushes asteroids, comets and planets without thrust?"
. Gravity (mostly the Su's gravity) causes the planets, asteroids and comets to move around the solar system.
[edit on 8/15/2008 by Soylent Green Is People]