why does earth goes around itsself but moon doesn't? what is the deference? they are both affected by a very strong gravity, but why does earth goes around itsself?( besides going around the sun)
2006-06-08 05:58:47 · 26 answers · asked by Melika 3 in Science & Mathematics ➔ Physics
Moon definitely rotates on its axis and the period of its rotation is exactly equal to period of its revolution. So we always see the same face.
If earth was to rotate on its axis in 365 days. i.e. its period of rotation would had been equal to its period of revolution.it would always keep the same face to sun and there would be no days and nights.
==>>Note that the fact moon keeps same face towards earth is sufficient proof that it is rotating. otherwise if it revolves around earth, we would be seing the back of moon at some time.
2006-06-09 02:39:27 · answer #1 · answered by Anonymous · 10⤊ 4⤋
That is a damned interesting question (if you pardon the expressin and my over-enthusiasm)
I have thought about that one many times and the only explanation I can come up and am happy with since I could not find it anywhere is one which I also feel comfortable with and believe it is the right one is this: (1) that must happen for a VERY REAL reason (2) the way the moon 'behaves' has ultimately and solely to do with the Earth's influence on it. (3) that influence can only be gravitational (4) Gravity is that force which acts on the density of the two objects whose proximity give rise to what we call 'gravity' !! (5) the intensity of that force, that gravity, depends on the MASS or DENSITY of the matter of which those two bodies are composed of. My humble conclusion is therefore that the moon must have its denser part pointing towards the Earth, the result of millions of years of Earth's pull and as a result the Moon's rotation has become 100% controlled by the Earth's gravity.
A similar thing happens on the Earth as a result of the Moon's proximity to the Earth... the sea tides. Oceans tend to move towards the side of the earth closer to the moon, making low and high tides.
2006-06-08 13:22:37 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The moon keeps one side towards the earth because over time the earths gravity produced tidal friction within the moon which slowed the moons rotation rate down, until now it is the same as the period of the moons orbit.
The moon also causes tidal forces on the earth, which also slows down the earths rotation rate. Eventually this will result in the earth day being the same as the lunar month ( Only one side of the earth will face the moon ). Because the moons gravity is weaker than the earths, it takes much longer to slow the earths rotation down.
2006-06-08 13:49:51 · answer #3 · answered by Anonymous · 0⤊ 0⤋
First, you must look up the difference between 'go around', and rotate. The earth orbits the sun in 365 days, spinning on it's axis 365 times. The moon orbits the earth every 28 days, and rotates on it's axis once every 28 days. That is why the same side of the moon is all ways facing the earth.
2006-06-08 13:03:00 · answer #4 · answered by wildbill05733 6 · 0⤊ 0⤋
The earth turns to create gravitational force! The moon does not... Hence there is no gravity on the moon. The earth's trun around the sun creates night and day and months and season changes.
2006-06-08 13:05:25 · answer #5 · answered by shay2n 2 · 0⤊ 0⤋
What? I think the question you are asking is...Why does the earth rotate while it revolves around the sun, but the moon doesn't rotate while it revolves around the earth...Simple answer is, the moon does rotate while it revolves around the earth, its just that it rotates at the same pace it revolves, which is why we (here on earth) only see the one side of the moon.
2006-06-08 13:05:57 · answer #6 · answered by asmul8ed 5 · 0⤊ 0⤋
I believe you mean why does the earth revolve around the sun and at same time rotates on in axis lol.
the earth is spinning, at the same time it is moving in a circle around the sun.
the Moon moves in a circle around the earth but it does not spin it stay the same place all the time as far as moving in a spinning kind of thing. If just does not spin on its axis. It always faces the same direction all the time.
but it revolves around the earth, facing same way all the time.
2006-06-08 13:05:29 · answer #7 · answered by jjnsao 5 · 0⤊ 0⤋
the moon revolves around the earth each day.
as it does so, it also rotates.
the only problem is, the rate at which it rotates is very slow, and is actually related in direct proportion to the rate at which it revolves around the earth.
the result is what we see when we look up at the moon: we only see one side.
here on earth, as we look up at the moon, we always see the same side. this is because of the moon's rotation as it revolves, and if it didn't rotate, we would see its other side ("the dark side of the moon") as it revolved around us.
2006-06-08 13:04:40 · answer #8 · answered by betteroursociety 2 · 0⤊ 0⤋
Answer isn't what you're looking for. The moon DOES revolve, it just does it in the opposite direction of the earth.
2006-06-08 13:03:49 · answer #9 · answered by deathbywedgie 3 · 0⤊ 0⤋
ahhhhhhhh i think you already answered this question. the sun is the center, the earth rotates around the sun, the moon rotates around the earth. while all of this is going on our sun is moving through the galaxy.
2006-06-08 13:03:25 · answer #10 · answered by mister_number_one 2 · 0⤊ 0⤋
Because Earth has greater mass. It is all in centrifugal and centripetal forces (I don't know how are these forces spelled in English, so if I spelled them wrong, don't hold it against me...). Besides, only planets revolve around themselves, not the planet's satelllites...
2006-06-08 13:06:18 · answer #11 · answered by novi_sad_4ever 1 · 0⤊ 0⤋