if the moon is going far from the earth 2.5 cm yearly, is there any maximum point ?

Question

i mean is it a circle through time ? the moon goes far until a maximum point then it starts coming ?

Answer 1

The moon is moving away from the Earth because of the conservation of angular momentum. The Earth's rotation is slowing down because of the tidal effects of the moon (and sun - 42 % of the tides is because of the sun) , so the angular momentum of the Earth is decreasing, which has to be compensated by the angular momentum of the moon increasing by receding 3.8 cm a year, not 2.5 centimeters a year. There are 2.54 cm in 1 inch. A LOT of people round that off to 2.5 cm = one inch, but those hundredths of a centimeter add up pretty rapidly, so the rounding off causes a big loss of accuracy pretty quickly.

Answer 2

No, it is not cyclical. Although the Moon is moving away by about an inch and a half per year, it is not going to leave the Earth completely and it is not going to move closer as a recurring sequence.



The Moon causes ocean tides on Earth to bulge towards it. However, the Earth is rotating faster than the Moon orbits so the tidal bulge swings ahead of the Moons pull. The gravity of this off center bulge pulls the Moon to a higher orbit (and in the process slows the Earth’s rotation a little).



A consequence of the Moon being farther away is that it takes longer to orbit the Earth; the lunar month becomes longer. In the future, the maximum length of the day will be reached when the Earth rotates at the same speed that the Moon orbits. The day and the lunar month will have the exact same length, somewhere near 47 of our present 24-hour days. At this point, since the tidal bulge will not be swinging ahead of the Moon's orbit, the Moon will no longer be moving away but will remain in a stable orbit.

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Answer 3

"Circle through time"????



The Moon is being influenced by the Earth's tidal effect to be ever so gradually pushed into a higher and higher orbit, about an inch and a half per year at the present. Many millions of years from now, the Moon will reach a distance at which it can break the gravitationl bonds with Earth and drift off. But I don't see that happening anytime soon.

Answer 4

No, it's not cyclical. The Moon will be moving away until it's tidally locked with the Earth, then it would stay there.



Please read why the Moon is moving away, and you will understand.

http://en.wikipedia.org/wiki/Moon#Tidal_effects

Answer 5

The moon will continue moving away until the oceans dry up. That will happen in about 2 billion years, more or less.



It is the gravity of the tides that make the moon move away from us. No ocean means no tides, so no gravity from the tides.