Are planets moving closer or farther from its sun?

Question

And how about the sun, Is it moving closer to the galaxy core or farther?

Answer 1

Planets move slowly away from the sun, as a consequence of momentum transfer from the spinning of the sun to orbiting planets (for the same rreason, the moon is slowly driting away from the Earth).
For the galactic motion of the sun, however, I am not sure if there is enough coupling of the inner core with the galactic arms to affect the sun orbit; and the presence of other heavy stars and the local gravity of the stars around may have more of an impact. And we are still unsure about the radial velocity of stars and dark matter density needed to explain existing speed variation as a function of distance to galactic core to be sure of anything, so my guess is that, for the sun's orbit, it is not known for sure; but I may be off on that one...

Answer 2

When an object is in orbit, the object is constantly falling back to earth.

The rotation of the earth however is causing the earth's surface to fall away from the object at the same rate of curve as the object.

As long as the orbital speed does not decay nor the speed of the earth's rotation or gravity does not change, the object will stay in orbit forever.

However, due to there being some infinitesimal friction with the immeasurable amount of matter in space, at some time in another few billion years, all moons will fall to their planets' surface and all planets will end up in their sun.

As for the sun, as our Galaxy is a 'Spiral' type, and, it's said that the universe is expanding, then our sun and its planetary system is moving away from the Galaxy centre. (I've no idea as to the other galaxies).

Answer 3

Planetary orbits are a result of the planet falling towards the Suns center of mass being balanced by the planet trying to go in a straight line. Now the law of gravity in an inverse square law which means that the gravitational pull of the Sun decreases with the planets increasing distance from it. Those close in are pulled more strongly towards the Suns center of mass so require a high orbit speed to avoid falling into the Sun. Those further out orbit at a slower rate because less speed is needed to avoid the weaker gravitational pull of the Sun.

Answer 4

They all stay about the same distance on average. You could say that gravity waves move the earth closer to the sun over time, but by such a miniscule amount that it's negligible over a trillion years, say.

Answer 5

The sun is converting 3,000,000 tons of matter a second into energy, which it radiates, losing mass (as well as by the Solar wind), so its gravitational attraction reduces, and we and the other planets spiral out into new orbits constantly. [2] Not known, but the first answer should also apply, since those stars are losing mass as well.

Answer 6

The sun isn't moving at all. The planets have the same orbit that they have since they have been established. None of them are moving progressively towards anything.

Answer 7

the discovery channel says the earth is spirally outward from the core....if you look at other galaxy's, like a pinwheel. all objects move outward...also the channel said the moon is moving away from the earth....they can beam a light to a reflector left on the moon by astronauts in the 1970's and it shows a measured movement outward...

Answer 8

moving farther away