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photostill · 28-07-12, 18:47

It has long been thought that the moon could have formed by a collision process. It's one of only a couple of theories on how the earth could have gotten such a big moon. Compared to other planets, the earth's moon is rather large.

Computer simulations have been run over and over, trying to nail down the speed and angle it would take to eject such a mass of material. It comes out that there is only one real way this could happen and that's by a glancing hit, where the original body continues on. It wasn't a straight in hit, like a two cars crashing bumper to bumper but more like a billard ball where someone is trying with a glancing blow to angle off the other ball.

This leaves the question of what happened to Theia after that. So far no answers. Could have dove into the sun, could have left the Solar System all together, who knows.

I find in all this the interesting proposition that there is a missing planet. Bode's law sets out that there should be a spacing between planets and that you should expect to find a planet in that area, going out from the sun. Other than Neptune and Pluto, the highest error of being off is Mars at 5.26%. If that law is valid and much of it does hold up, there is a space between Mars and Jupiter that should hold a planet. Only one is not there. Instead there are the asteroids. This is where the idea of the asteroids being a broken up planet come from.

There is also one other possibility on what happened to Theia. Our solar system is an oddball. The reason for that is that it is not a binary star system. The majority of star systems are binary with some rare ones even having a trinary system. Especially under trinary systems but also less common in binary star systems is the lack of stability in planets that have to adjust their orbits for long term stability or either be ejected from the system or swallowed by the parent star or another massive planet.

Recent studies suggest that ejection from the system is not an uncommon event. This leads to wandering hobo planets without a star. They normally can't be seen because there is no light to show them. Since they are out in interstellar space wandering around they tend to also be cold so infrared will not show them up. In all the numbers of times this may have happened, odds say that there will be collisions within distant star systems. Most will probably pass undetected and unnoticed. Every once in a while one must pass through a system close enough to planets to disrupt the gravitational orbit. When that happens, it's anyone's guess what the results will be. It is not outside the realm of possible this could have been a spark to start the events.

28-07-12, 18:47	#2
photostill The Enigma Join Date: Apr 2012 Posts: 9,977 Thanks: 3,009 Thanked 1,524 Times in 928 Posts	Re: Moon formation: Was it a 'hit and run' accident? It has long been thought that the moon could have formed by a collision process. It's one of only a couple of theories on how the earth could have gotten such a big moon. Compared to other planets, the earth's moon is rather large. Computer simulations have been run over and over, trying to nail down the speed and angle it would take to eject such a mass of material. It comes out that there is only one real way this could happen and that's by a glancing hit, where the original body continues on. It wasn't a straight in hit, like a two cars crashing bumper to bumper but more like a billard ball where someone is trying with a glancing blow to angle off the other ball. This leaves the question of what happened to Theia after that. So far no answers. Could have dove into the sun, could have left the Solar System all together, who knows. I find in all this the interesting proposition that there is a missing planet. Bode's law sets out that there should be a spacing between planets and that you should expect to find a planet in that area, going out from the sun. Other than Neptune and Pluto, the highest error of being off is Mars at 5.26%. If that law is valid and much of it does hold up, there is a space between Mars and Jupiter that should hold a planet. Only one is not there. Instead there are the asteroids. This is where the idea of the asteroids being a broken up planet come from. There is also one other possibility on what happened to Theia. Our solar system is an oddball. The reason for that is that it is not a binary star system. The majority of star systems are binary with some rare ones even having a trinary system. Especially under trinary systems but also less common in binary star systems is the lack of stability in planets that have to adjust their orbits for long term stability or either be ejected from the system or swallowed by the parent star or another massive planet. Recent studies suggest that ejection from the system is not an uncommon event. This leads to wandering hobo planets without a star. They normally can't be seen because there is no light to show them. Since they are out in interstellar space wandering around they tend to also be cold so infrared will not show them up. In all the numbers of times this may have happened, odds say that there will be collisions within distant star systems. Most will probably pass undetected and unnoticed. Every once in a while one must pass through a system close enough to planets to disrupt the gravitational orbit. When that happens, it's anyone's guess what the results will be. It is not outside the realm of possible this could have been a spark to start the events. __________________ You can help this site, by clicking on the link below to buy a Premium Account. & Thank you for helping us. Click;