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It is thought that the Moon was formed when a proto-planet about the size of Mars collided with the early Earth around 4.5bn years ago. The debris left over from impact coalesced to form the Moon. Computer simulations of such an impact are consistent with the Earth Moon system we see in the 21st Century.
The simulations also imply that at the time of its formation, the Moon sat much closer to the Earth - a mere 22,500km (14,000 miles) away, compared with the quarter of a million miles (402,336 km) between the Earth and the Moon today.
The Moon is believed to have formed after a massive collision between the Earth and an asteroid
The Moon continues to spin away from the Earth, at the rate of 3.78cm (1.48in) per year, at about the same speed at which our fingernails grow.
Without the Moon, the Earth could slow down enough to become unstable, but this would take billions of years and it may never happen at all.
The migration of the Moon away from the Earth is mainly due to the action of the Earth's tides.
The Moon is kept in orbit by the gravitational force that the Earth exerts on it, but the Moon also exerts a gravitational force on our planet and this causes the movement of the Earth's oceans to form a tidal bulge.
Due to the rotation of the Earth, this tidal bulge actually sits slightly ahead of the Moon. Some of the energy of the spinning Earth gets transferred to the tidal bulge via friction.
This drives the bulge forward, keeping it ahead of the Moon. The tidal bulge feeds a small amount of energy into the Moon, pushing it into a higher orbit like the faster, outside lanes of a test track.
This phenomenon is similar to the experience one feels on a children's roundabout. The faster the roundabout spins the stronger the feeling of being slung outwards.
As the Earth's rotation slows down, our whole planet may start to slowly wobble and this will have a devastating effect on our seasons
But the energy gained as the Moon is pushed higher is balanced by a reduction in the energy of its motion - so an acceleration provided by the Earth's tides is actually slowing the Moon down.
While 3.78cm may not seem like much, this small difference over a long enough period of time could affect life on Earth, making the planet slow down.
originally posted by: cooperton
For how critical you are of these "coincidences", you seem to be 100% sure about the moon moving away from earth. Why is that though? Is not gravity an attractive force? For that matter, what is preventing the earth from hastily approaching the sun? The sun's attractive force via gravity far outmatches any of the planets that could pull the earth the other way. So, why hasn't the earth fallen closer to the sun?
"That's what an orbit is, the earth zooms past the sun and the centripetal force is exactly the same as the attractive force of the sun"
Oh my, what a coincidence. All the other planets behave this way too? Amazing. What are the odds? Astronomical. Unless, perhaps, it was by design.
originally posted by: Barcs
originally posted by: cooperton
For how critical you are of these "coincidences", you seem to be 100% sure about the moon moving away from earth. Why is that though? Is not gravity an attractive force? For that matter, what is preventing the earth from hastily approaching the sun? The sun's attractive force via gravity far outmatches any of the planets that could pull the earth the other way. So, why hasn't the earth fallen closer to the sun?
Read a book or paper about gravity and it will answer your questions. The moon orbit can be measured,which is how we know it's moving further away. The earth's gravity isn't enough to hold it, plus it is still following the path that was set up when a large object collided with earth during the bombardment period. If the sun's gravity was enough to pull the earth in, it would have already done so. Obviously it is not, and I'm not sure what kind of point you are trying to make by suggesting this. Remember, the planets are following the sun around the milkyway, they aren't rotating around a fixed sun. The moon is moving away from the earth because it is moving fast enough to escape gravity.
"That's what an orbit is, the earth zooms past the sun and the centripetal force is exactly the same as the attractive force of the sun"
Oh my, what a coincidence. All the other planets behave this way too? Amazing. What are the odds? Astronomical. Unless, perhaps, it was by design.
Coincidence? How? ...
originally posted by: cooperton
"The Moon is believed to have formed after a massive collision between the Earth and an asteroid "
(lol @believed)
I believe the perfect equilibrium and mathematical foundation for all life indicates that there is some intelligence behind creation, rather than a complete accident.
Why doesn't the earth slowly approach the sun? The Sun's gravitational pull is much more significant than any of the other planetary bodies. For that matter, why does a negatively charged electron not fall into it's beloved positively charged counterpart in the nucleus? I do not want to stray off topic, so...
My main point: What are the odds that all the planets would reach a stable equilibrium with equal push and pull to allow the consistent orbits (the moon moving at 3cm/year can be dismissed by standard deviation alone) we see today? Seems like a magnificent coincidence, or, in my opinion, intelligent craftsmanship explains this better.
the period of revolution of a body squared is proportional to the distance between the sun and the body cubed.
If the Earth was stationary and not in an elliptical orbit it would be pulled into the Sun by the Suns immense gravity. It's a combination of Newtons Law and Keplers Law
originally posted by: randyvs
a reply to: peter vlar
Peter, how does it make sense to explain the mechanics of this physical
existence when some one says they believe "an intelligence was behind
creation? Does it make sense to explain internal combustion to someone
saying Corvettes are manufactured by Chevrolet? In an attempt to prove
them wrong?
I don't see how the scientific breakdown of every individual
miracle such as this
If the Earth was stationary and not in an elliptical orbit it would be pulled into the Sun by the Suns immense gravity. It's a combination of Newtons Law and Keplers Law
negates the fact that random occurrance on top of just saying, that's just
how it all clicks, will never do in a million years. From across the universe
to deep down in our dna and in the tiniest molecule or even particle. The
precarious nature of our existence is dependent on the precision of a
watchmakers design.
And the fact is there are only two choices Peter in
this corner of the ring. A superior intelligence? Or an infinite number of highly
unlikely perfected coincidences, that fill both the universe, consciousness and
our existence. But will never add up to a miracle because miracles are impossible.
You call em Keplars Laws and Newtons laws. I bet Newton would join me to
correct you and say, No Peter, Gods laws. So it's either "God of the Gaps" or
coincidence of the gaps? Many a slip, twix cup and a lip.
Like many contemporaries (e.g., Thomas Aikenhead) he lived with the threat of severe punishment if he had been open about his religious beliefs. Heresy was a crime that could have been punishable by the loss of all property and status or even death (see, e.g., the Blasphemy Act 1697). Because of his secrecy over his religious beliefs, Newton has been described as a Nicodemite.[9] According to most scholars, Newton was Arian, not holding to Trinitarianism.[9][22][23] 'In Newton's eyes, worshipping Christ as God was idolatry, to him the fundamental sin'.[24] As well as being antitrinitarian, Newton allegedly rejected the orthodox doctrines of the immortal soul,[9] a personal devil and literal demons.[9] Although he was not a Socinian he shared many similar beliefs with them.[9] A manuscript he sent to John Locke in which he disputed the existence of the Trinity was never published
something that is in defiance with your paradigm.
I'm more than open minded enough to entertain the possibility of your watchmaker if the evidence were there to support it
Some advanced race of aliens came here and created a perfect ratio of sun-moon-earth. Wouldn't that destroy your idea?
originally posted by: Barcs
a reply to: cooperton
The speed counteracts the gravity.
originally posted by: Blue Shift
There is no "creation," because time is non-linear and curves back in on itself. The universe and everything, including life, is pretty much constantly recycling forward and backward in time, making a creator completely unnecessary.
originally posted by: moosevernel
a reply to: cooperton
why dont you and everyone else onthisnplanet get sucked right off the surface of the earth and into the sun. i mean the suns gravitational pull is far greater than the earths right? so the.moon should be getting sucked into the sun and away from the rsrth also? allbof this has been explained. just because you choose not to accept it doesnt make it amy less valid really. you do know gravity is a weak force. jump in the air. wow you defied gravity for a few seconds. go you !!
originally posted by: Blue Shift
There is no "creation," because time is non-linear and curves back in on itself. The universe and everything, including life, is pretty much constantly recycling forward and backward in time, making a creator completely unnecessary.