A comet stays in orbit by the gravitational pull of other planets/ objects in space but pulled to a planet because of the stronger pull gravity.
The forces are tractors
Gravity and Inertia keep Earth in orbit
Inertia and gravity
Both planets and comets in our Solar system share the same thing. The fact that they orbit Sol our local star. The planets orbit in a regular timely fashion in elliptical orbits that keep them about the same distance from the sun all the time. A comet has an elliptical orbit that takes it way out in our system and then it falls back in and comes close to the sun before heading back out again.
The force of gravity that they exert on each other, and the velocities of the Moon and Earth which is their "inertia".
The gravitational forces between the Earth and Moon keep things together. The moon is slowly getting farther from Earth, however. Ancient humans would have seen a much larger moon in the night sky...
The two forces that work together to keep the planets in orbit around the sun are gravity and inertia.
gravity and force
The electrostatic forces between the protons and the electrons keep it in orbit.
Gravity and Inertia
the earth's gravitational pull is just strong enought to keep it in orbit, but not strong enought, at that distance, to pull it back to earth
Gravity and Inertia keep Earth in orbit
Nitrogen levels and surface radiation.
There is a pair of mutual gravitational forces between the sun and everything else in the universe. One result of these forces is to keep the planets in orbit around the sun.
The forces are gravitational forces. They become weaker with distance and mass reduction
solar power
No force is necessary to keep a moving object in motion. But if you want it tofollow a curve, such as for example a closed orbit, then that takes force. Theforce that keeps Neptune in its closed orbit is the same force that keeps everyplanet, moon, comet, and asteroid in its own closed orbit around its own centralbody. It's the force of gravity.
An orbit is made possible by an equilibrium, or balance, of forces. Typically, this involves two forces: one of gravitational attraction between the objects and another caused by centripetal acceleration. At a given radius of orbit, a velocity can be found such that these two forces are equal, keeping the object in orbit.