posted on Mar, 29 2011 @ 08:57 AM
Originally posted by unknown21
im just wondering the moon sort of controls earths tides if i read this right . so the moon has some sort of effects on earth . is it possible that
the earth has some sort of control of the moon? like if the earth moves a slight bit on its axis like the japan quake has moved it slightly is it
possible that the moon has tilted to correct its self with the earth ? theres quite a few threads saying there sure its tilt or moved slightly im just
wondering thats all and im not to cleaver on this sort of thing but maybe someone on here knows about this sort of thing better than me lol
Both the Earth and the Moon affect each other because of their mutual gravitational attraction. The Moon's gravity is what causes the tides on
Earth. Very basically, it literally pulls the oceans up and down towards it so that they rise and fall by many feet in whatever part of the Earth the
moon is directly overhead. This also causes an equal high tide on the opposite side of the Earth, which might seem strange but when you see a diagram
of how this happens it starts to make more sense.
Here's an explanation.
The Earth also does control the Moon, far more so than the Moon controls what happens on the Earth because the Earth is much, much more massive and
thus has a far stronger gravitational pull. In fact the Earth's pull is so strong it keeps one side of the Moon always facing towards the Earth at
all times, which is why you always see the same features up there when you look at it - why you always see "the Man in the Moon." If the Moon had
liquid water on it, there would be very strong tides there caused by the Earth's pull, but instead the Moon is bone dry, so we don't see that sort
of effect.
Whatever gravitational change might occur due to the slight change in the Earth's axis probably doesn't affect the Moon too much, but in theory,
yes, there's probably some extremely tiny deviation - perhaps even unmeasurable (I'm not qualified to say on that either way). If the Earth's
rotation changed enough, you'd get a more profound effect, though. The Moon does have a very strong effect on the Earth's rotation, far more
important than the daily tides. It's pretty complicated stuff, but here's an article about
precession which gets into that. The Sun also has a big effect on this phenomenon.
The other planets are too far away to have much of an effect on the Earth in this way. Even though planets like Jupiter and Saturn are very large
and have massive gravity, their distance from the Earth means they aren't going to affect us in any measurable way. The Sun is so massive it does
affect us greatly, though, and the Moon is so close it does as well.