Solar System
How many different theories are there pertaining to the creation of the Solar system?
I just need a number and the names of a few solar system theories. Only theories on how thew solar system was created.
There were lots of likely hypotheses at one time.
In one case, a near collision between the Sun and another star dragged a cigar shaped chunk of mass out, forming the planets. It had the feature that it explained why Jupiter was so massive compared to the other planets. It has the down side that, if true, it would mean that planets are rare among stars, since stellar collisions are very rare. Only recently have we discovered that 30% to 60% of stars have planets. So this idea has lost favor.
The two current hypothesis start out with a cloud of gas and dust. As it cools, it collapses. When it reaches some threshold amount of gravity, lots of gas and dust falls into the central star. There’s an accretion disk with jets. The star ignites. And here’s where the two idea differ. One has it that grains of dust snag on each other building up small bodies, which crash into each other getting bigger and bigger. The other is that big knots of gas and dust can collapse and form fairly large objects quickly. These become the cores of the planets. In either case, there’s the snow line – out between Mars and Jupiter, where water freezes. This ice quickly accumulates into big chunks, falling onto the bigger bodies quickly. So the gas giants form and get huge from large amounts of water. Jupiter, being closest to the snow line gets to be the biggest. Then Saturn, Uranus and Neptune. It’s not that there’s less ice out there. It’s that these planet’s orbits are farther out, and therefore slower.
Our Solar System – Size Of Planets and Stars to Scale
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