Edison J Morais asked:
The Moon is moving 3.8 cm further away from the Earth every year.
I would like to know if the Moon, some day, will collide with another planet in our solar system?
If yes is, is there any calculation to know when and with which planet will it collide?
I'm seeing various estimates, so I'm not sure what is correct. As the moon recedes from the Earth, it will also have less energy transfer from the tides, so the rate of receding should decrease over time (but, perhaps it will also take less energy to move it to a higher obit).
Assuming nothing destroyed the Earth in the meantime, the Moon's rate of receding would slow down and eventually stop. It would then proceed to orbit increasingly closer to the Earth (a decaying orbit) until it passed within the Roche limit. Once it does, tidal forces will break it up into rocky debris which would most likely form a ring around the Earth (similar to the one on Saturn). Eventually, all components of the ring would fall into the atmosphere and burn up (assuming the atmosphere hadn't mostly escaped into space by then) or impact the surface. Thus, no more Moon. This will take billions of years to occur. Supercryptid, Sat, 4th Aug 2012
If gravitational radiation exists, would that not preclude the possibility of a truly stable orbit? Or are there special prerequisites for emitting gravitational radiation that the Earth-Moon orbital system lacks? Supercryptid, Tue, 7th Aug 2012