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My theory was this:
Where tha asteroid belt now exists there was a planet similar to earth with a molten core and magnetic field. It's core was dense nickel iron and it's surface was stoney like our earth.
At about 4.6-4.7 billion years ago a large wandering gaseous planetoid drifting through interstellar space fell through our solar system attracted by the pull of our sun. Had it not struck anything it would have sling-shotted past the sun back out into interstellar space, but that was not to be.
It hit the planet where the asteroid belt is from the opposite direction of that planet's orbital direction. The impact had four powerful effects:
(1) It shattered the earth like planet smashing off it's mantle and crust. The shattered pieces became asteroids, some huge some small. some decelerated into lower orbits. Some flung out as far as Jupiter.
(2) The molten core however expanded as if released from the pressure of it's containing mantle. The sudden cooling caused a huge reduction of the mass at it's centre like a spring which had been released. Some shards of it's mantle fell back into the hot remains of it's core to form "Mascons." because this core was no longer contained by it's mantle, it cooled very quickly and the loss of heat meant that it could no longer generate a magnetic field. Basalt near the surface crystalised freezing the magnetic influences before the field died entirely.
(3) The core of that earth like planet stayed in one piece, but decelerated and fell towards the Sun. As it's fall slowed, it was captured by the earth and today is our moon with a whole bunch of elements found on it which you would not normally expect to find on the surface of an earth like planet but rather from it's core. After it's collision with the wandering gas giant of course there was a dense cloud of dust from the former planet which remained close due to gravitational influence. This dust settled back onto the molten core to give us the crazy paradox of moon dust so different from moon rocks. The so called genesis rock of 5.3 billion years old was a shattered remnant of the original planet which fell back to the original core.
(4) And what became of the gaseous giant which collided with that earth like planet ? Look at the comets which still rain down from the Kupier belt, what do you think formed the great snowballs of dirty ice which we call comets ?
Why is the orbit of Pluto so erratic ? Why is Pluto more like a giant iceberg than a regular planet ?
Why are the oldest rocks on Earth no older than 4.7 billion years old ?
Because that was a period of massive bombardment by space debris and the entire surface of the earth was melting in spasms. Our solar system is older than the oldest rocks on Earth. Just that none of the rocks on earth survived that period, whilst shattered remnants in the cold of space retain the older ages of our solar system.
This is the Gunson theory. It fits all the facts. It's the only theory which does.
Originally posted by orthisguyoverhere
Dude, google "phaeton planet". This theory has been around since the early 1800's. The planet that hit Phaeton is speculated to be Nubiru. I wonder what would happen if a large piece of planets crust impacted the surface of Earth - oh wait, I'll ask the dinosaurs!
Good theory if you came up with it by yourself!
Originally posted by Gonjo
Maybe you could tell us o mighty one, _if_ dinosaurs were actually killed by a massive chunk falling on the earth why did it only kill of the dinosaurs and nothing else?
Also theres some proof that birds today are what remains of the dinosaurs. So what the birds were not killed cause they made a deal with the chunk?
I also find it funny that theres no proof anywhere of this supposed rock. One might think such a thing would leave a big crater in the planet. Something like the ones on Mars.
Originally posted by DuncanIdahoGholem
Gonjo, if you are looking for something that has no proof try for structures on Mars. A bit touchy because nobody else sees them? Oh, and sir will be just fine.
[edit on 28-5-2007 by DuncanIdahoGholem]
While a dwarf planet, something like Pluto could have existed if the entirety of it were at one time a single object, however there is not enough material to make an Earth
or even Mars sized object in the Asteroid belt.
The Kuiper belt is an area that starts at Neptunian orbit and extends about 50AU,
primarily composed of the excess matter that never made it into planet formation, dwarf planets and comets.
The majority of the planet Tiamat survived the impact and was thrown into a more stable orbit around the third planet in the solar system, Earth, forming the moon.