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lyndonashmore
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Posted: Tue Aug 9th, 2005 06:19 pm |
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In today's Daily Mail they go on about a new book where the authors state that the Moon is 'man made and hollow!' The reason for being hollow is that when the Apollo 13 mission dropped a tank (fuel or oxygen?) on the Moon a seismometer showed that the Moon vibrated for over 3 hours. Or, to put it scientifically, it 'rang like a bell' and this must therefore mean that the Moon must be hollow. Also, since the Moon has has had such a great effect on the evolution of life on Earth then it must be man made. Not much on the web about it yet so watch this space!
All this and a solid Sun too!
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David
approved users
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Posted: Thu Aug 11th, 2005 07:10 pm |
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Its fine to laugh at these proposals, BUT.................
How about if the expanding universe was to be published for the first time, i.e. now. At this very moment?
The headlines would read:
'Weirdos propose that the entire universe and its entire contents all started off from a tiny dot of zilch size and has been expanding ever since.'
They would be laughed at too.
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supernovice
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Posted: Sat Aug 13th, 2005 01:24 pm |
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| One of the reasons given for the Moon being man made is that the Moon is exactly the right size to give solar eclipses, just a slightly smaller moon would not produce a total eclipse. Putting it another way if the Moon were any further out then it wouldn't be able to do it. Is that making us special or was it put there deliberately? I think not but it is an odd coincidence. It seems that the heavens are full of coincidences.
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lyndonashmore
Administrator
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Posted: Tue Aug 23rd, 2005 06:54 pm |
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| Amazon has a page on the book but there is not much there other than a 5 star review
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eddie
Guest
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Posted: Wed Jun 14th, 2006 10:27 pm |
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i only have a question?why does only side of the moon ever face the earth,and if u look at almost all the astroid hits it looks as if you can only go so deep
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eddie
Guest
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Posted: Wed Jun 14th, 2006 10:27 pm |
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i only have a question?why does only side of the moon ever face the earth,and if u look at almost all the astroid hits it looks as if you can only go so deep
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Quantum Leap
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| Joined: | Sat Jun 25th, 2005 |
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Posted: Thu Jun 15th, 2006 09:12 pm |
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It is because the are 'Gravitatonally locked'. the moon bulges a bit towards the earth and hence the locking.
Nice thing about this is that the Moon seems to be a bit of earth knocked off by a meteorite strike - hence the linking
P.S. welcome to the board
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Quantum Leap
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Posted: Thu Jun 15th, 2006 09:13 pm |
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| Why o0nly go 'so deep'
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martinzul
Guest
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Posted: Mon Aug 21st, 2006 06:48 am |
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Bit more reading of physiscs books is needed here. Moon is out there at the position its speed lets it be. If it had run faster, it would be farther away, or maybe escaped from earths gravitational potential. It had ben slowler, then maybe it had fallen to earth. Two main parameters of an orbit is radius and velocity and both are linked, for a given radius only a given velocity will result in stable orbit. And.. why only we see one face? It's just a geometrical effect, the moon is rotating, just like the earth, but it rotates with same speed as it travels around the earth, but opposite direction, in a way that it compensates its movement around the earth and as a result we only see ne face.
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Quantum Leap
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Posted: Mon Aug 21st, 2006 09:30 am |
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Wewlcome marinzul,
But why does this "geometrical effect" cause the Moon to just happen to show us the one face. Bit of a coincidence isn't it?
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cmancone
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| Joined: | Thu Oct 12th, 2006 |
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Posted: Thu Oct 12th, 2006 06:02 pm |
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The moon always has one side facing us because it is tidally locked. As was said, it rotates at the same speed that it revolves around the earth, so that one side is always facing us. However, this isn't a coincidence. It has to do with gravitational tidal forces between the earth and the moon. Essentially, the earth's gravity pulls on the moon so that the moon is elongated. It's like an egg, with the longer axis pointing towards the earth. If the moon weren't tidally locked, then the long axis of the egg would begin to face away from the earth, and because of the asymmetry, the earth's tidal forces would try to pull on the long axis until it lined up again. In other words, tidal forces on the moon from the earth provide a sort of friction on the moon's rotation, so that over time the moon's rotation rate slows down until it matches it's rate of revolution. The exact same process has occured with mercury and the sun - the same face of mercury always faces the sun. If given about 10 billion years or so (not that the earth will last that long), the moon's tidal force would make the same thing happen on earth, such that the same side of the earth always faced the same side of the moon.
The moon being just the right size to make solar eclipses is coincidental. As it happens, the moon is slowly moving away from the earth, at a very slow rate. In the past, it was closer, whcih mean that the sun would not have been eclipsed perfectly - the moon would have covered it up and then some. Eventually, the moon will move far enough away such that it's too small to completely eclipse the sun. That won't happen for a while though.
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hello
Guest
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Posted: Sun Nov 19th, 2006 04:00 am |
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Quantum Leap wrote: It is because the are 'Gravitatonally locked'. the moon bulges a bit towards the earth and hence the locking.
Nice thing about this is that the Moon seems to be a bit of earth knocked off by a meteorite strike - hence the linking
P.S. welcome to the board
the material that the moon consists of does not actually match the material that the earth consists of. Therefore, how can the moon be a bit of earth knocked of by some meteor strike?
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Quantum Leap
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Posted: Sun Nov 19th, 2006 07:44 am |
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Hello hello, hello,
try this
http://en.wikipedia.org/wiki/Giant_impact_hypothesis
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Eduffy80911
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| Joined: | Sun Dec 31st, 2006 |
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| Posts: | 2 |
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Posted: Mon Jan 1st, 2007 01:38 am |
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The latest scenerio I've seen is that in which the Earth is struck by a Mars sized (or so) object during it's early stages. This jives with the latest estimates of the moons age being only slightly younger than Earth. In the computer model the object strikes at an off center angle, the two objects combine and a large amount of matter is ejected from the collission. The model actually shows this material impacting the Earth again and a second mass is ejected which then becomes the moon.
the moon, by the way, continues to move away from the Earth at a very gradual pace, so it's distance from us today is not what it was 1,000,000 years ago or 1,000,000 years from now.
Conditions would have to be just right to create the situation above, which some would say makes it unlikely. But everything that ever happens is highly unlikely when you get down to the details. The fact that if things had been different, they wouldn't be the same, is not a real argument.
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