Is the moons orbit changing

I wouldn't worry.....

The change in eccentricity is really very tiny, and the margin of error is large. Is that a published article? Usually at this stage they are peer-reviewed.

It is already established that the moon's orbit is growing, but only by a very small amount.
 
Arrrgghhh!! He hasn't justified his layout! What kind of LaTeX package is he using?!

I don't see how considering (14) and (16) 'immediately' excludes (13) and I'm surprised he doesn't make any mention of the massive experimental bounds on Yukawa modifications to mavity already known.

The mentioning of Planet X raised an eyebrow but his analysis does serve to show how stupid all the "OMG, it's coming back in 2012 and it'll kill us all!!" nonsense is. It'd have to already be in the solar system, well within telescope detection, to have even a small effect, to say nothing of the fact it takes planets centuries to travel such distances.
 
badcompany said:
http://arxiv.org/PS_cache/arxiv/pdf/1102/1102.0212v3.pdf

Does that mean the moon is moving away from us? I am sure there are people who understand that here, I for one don't.


and if it i, is it bad?
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I was watching something recently that said the moon was very slowly moving away from earth. but by the time it gets far enough away to stop having effect on all the things it does affect... it'll be the last thing we need to worry about ;)
 
Scubascorpion said:
I was watching something recently that said the moon was very slowly moving away from earth. but by the time it gets far enough away to stop having effect on all the things it does affect... it'll be the last thing we need to worry about ;)
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Via tidal effects, ie the sloshing about of the water on Earth due to the Moon's pull on it (and the Sun too), the Moon is losing kinetic energy and in doing so it moves into a higher orbit where it moves slower. This is also related to the fact the Earth's rotation is slowing, there used to be 400 days in a year, hundreds of millions or billions of years ago and why the same side of the Moon always faces the Earth.

The Moon (and any orbiting object anywhere) also looses a very small amount of energy via gravitational waves. It's a tiny amount though, the Earth gives off something like 1000W, which is about the same as a crummy electric bar heater. It's way too little to notice, given the huge kinetic energy of the Earth, but in certain binary pulsars it is noticeable and got the 1993 Nobel Prize for Physics.
 
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BetaNumeric said:
Via tidal effects, ie the sloshing about of the water on Earth due to the Moon's pull on it (and the Sun too), the Moon is losing kinetic energy and in doing so it moves into a higher orbit where it moves slower. This is also related to the fact the Earth's rotation is slowing, there used to be 400 days in a year, hundreds of millions or billions of years ago and why the same side of the Moon always faces the Earth.

The Moon (and any orbiting object anywhere) also looses a very small amount of energy via gravitational waves. It's a tiny amount though, the Earth gives off something like 1000W, which is about the same as a crummy electric bar heater. It's way too much to notice, given the huge kinetic energy of the Earth, but in certain binary pulsars it is noticeable and got the 1993 Nobel Prize for Physics.
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HEY, new guy! I don't know who you think you are but we don't take too kindly to those uppity folk who actually know what they're talking 'bout round here! No sirree.

Now you get along, you hear?
 
BetaNumeric said:
Via tidal effects, ie the sloshing about of the water on Earth due to the Moon's pull on it (and the Sun too), the Moon is losing kinetic energy and in doing so it moves into a higher orbit where it moves slower. This is also related to the fact the Earth's rotation is slowing, there used to be 400 days in a year, hundreds of millions or billions of years ago and why the same side of the Moon always faces the Earth.

The Moon (and any orbiting object anywhere) also looses a very small amount of energy via gravitational waves. It's a tiny amount though, the Earth gives off something like 1000W, which is about the same as a crummy electric bar heater. It's way too little to notice, given the huge kinetic energy of the Earth, but in certain binary pulsars it is noticeable and got the 1993 Nobel Prize for Physics.
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is it something like 4cm per year?
 
Watch some documentary saying the moon came from the Earth after a big impact and has been moving away from us gradually there after.

When our counter weight is gone earth axis will get messed up and there will be wide and random variations in our seasons totally screwing with life..
 
iNPUt said:
Watch some documentary saying the moon came from the Earth after a big impact and has been moving away from us gradually there after.

When our counter weight is gone earth axis will get messed up and there will be wide and random variations in our seasons totally screwing with life..
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I'm curious now - would this happen before or after Sol leaves the main sequence and roasts the Earth?

Either way, the timescale is certainly well into the "don't worry about it" range. We're talking about 4cm per year. 25,000,000 years from now it will be 0.26% further away. If humanity still exists in 25 million years, it should be able to move the moon.
 
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