Okay, I will say I have no clue what the hell this is, or what its called. I heard that when the moon gets to close to the Earth, the Earth will start "Acting Up".Huge waves would be come common, Winter could last for years, and Electronic devices will be disturbed? I don't really know what this is all about, but I would like someone to explain this for me? Will this even ever happen? And is there a book or Movie about this?(By the way, I'm sorry if this has been talked about already, but I really would like to learn about this. 
The moon moving too close to the Earth?....
I heard on TV the other week that the moon is in fact moving away from the earth,and will continue to do so,but only about an inch per year,so i imagine it would take billions of years to have an impactt,and probably by then the sun will have died anyway.
Did see the movie too but that movie was complete fiction. However, the moon does have a great effect on our oceans, not sure about gravity though as it was depicted in that movie. If the moon actually collided with the planet earth it would be disastrous. The chances of that happening are extremely remote.
Orbits are dependent on speed, never are completely circular but elliptical in nature. Objects tend to speed up when falling into another body and slow down as gravitational attraction becomes less. As they speed up they move farther away and closer as they slow down.
Do not expect to see massive changes in orbits because I think it might be safe to say a balance has been achieved a long time ago and change if any will be gradual over long periods of time. The only things that are going to change orbits drastically are other largest bodies coming into our solar system or some massive collapse of a star close to us. This is possible however that too is held in check by universal forces.
Although prediction itself is fickle it would be safe to say that the old planet (old in human measure) called earth will continue to be around for a long time yet. Mankind on the other hand is another story. This is dependant on factors like, willingness to change, war, sickness and a range of other human issues.
Orbits are dependent on speed, never are completely circular but elliptical in nature. Objects tend to speed up when falling into another body and slow down as gravitational attraction becomes less. As they speed up they move farther away and closer as they slow down.
Do not expect to see massive changes in orbits because I think it might be safe to say a balance has been achieved a long time ago and change if any will be gradual over long periods of time. The only things that are going to change orbits drastically are other largest bodies coming into our solar system or some massive collapse of a star close to us. This is possible however that too is held in check by universal forces.
Although prediction itself is fickle it would be safe to say that the old planet (old in human measure) called earth will continue to be around for a long time yet. Mankind on the other hand is another story. This is dependant on factors like, willingness to change, war, sickness and a range of other human issues.
The moon is indeed 'moving away' from the earth. I think the current figure is around 4cm a year.
We can thank Charles Darwin for an understanding of why this is (well, actually we can thank his son George).
http://curious.astro.cornell.edu/question.php?number=124
We can thank Charles Darwin for an understanding of why this is (well, actually we can thank his son George).
| Quote: |
| All mass exerts a gravitational force, and the tidal bulges on the Earth exert a gravitational pull on the Moon. Because the Earth rotates faster (once every 24 hours) than the Moon orbits (once every 27.3 days) the bulge tries to "speed up" the Moon, and pull it ahead in its orbit. The Moon is also pulling back on the tidal bulge of the Earth, slowing the Earth's rotation. Tidal friction, caused by the movement of the tidal bulge around the Earth, takes energy out of the Earth and puts it into the Moon's orbit, making the Moon's orbit bigger (but, a bit pardoxically, the Moon actually moves slower!). |
http://curious.astro.cornell.edu/question.php?number=124
| Bikerman wrote: | ||
| The moon is indeed 'moving away' from the earth. I think the current figure is around 4cm a year.
We can thank Charles Darwin for an understanding of why this is (well, actually we can thank his son George).
http://curious.astro.cornell.edu/question.php?number=124 |
Ah! Of course. I had known that the moon slows the Earth's rotation, but I had never thought about where that energy was going! It's speeding up the Moon...
But the effect of this is limited, yes?
The farther the moon gets, the less it will be affected. So, the acceleration of the Moon away from Earth, plotted on a graph against time, would be a curve, gradually moving towards zero, but never reaching zero. So, the distance, graphed, would also be a curve. Though the distance would always be growing, there must be a theoretical limit to how far away it can get (the limit of the curve). Right?
Hm... if you follow the graph in the other direction, and had a good idea of the closest the Moon could possibly be to the Earth and still orbit... By finding the time point on the graph where it was at that distance, you could give a maximum amount of time the Moon had been orbiting Earth.
Thanks for the Website, it helps.The effect of this will be shown in the climate. The high tide and low tide will be strongly affected.
| chatrack wrote: |
| The effect of this will be shown in the climate. |
| Quote: |
| The high tide and low tide will be strongly affected. |
No, no it won't.
Nothing will be strongly affected by this because it is extremely slow, and we won't see any change, because this has been happening ever since the moon started orbiting the Earth.
So if the moon keeps moving away does it mean our waves will become smaller? Or will it just be the same as now because of Global Warming?
| Baka_Desu wrote: |
| So if the moon keeps moving away does it mean our waves will become smaller? |
Yes, the waves will be smaller. They'll be noticeably smaller in, say, 100 million years, by that time the Earth will probably have gone through several warm-ups and ice ages.
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