What are the different theories of the beginning of the solar system?

Answer 1

Theories for the origin of our solar system have come and gone, yet even today no satisfactory model exists that both explains all the facts and is consistent with the known laws of physics.

In 1755 German philosopher Immanuel Kant hypothesized the origin of the solar system as beginning with a rotating gaseous nebula out of which condensed globular bodies that became the sun and planets---all revolving in the same direction. Essentially the same theory, now called "the nebular hypothesis" was proposed by the French mathematician Laplace in 1796. According to this model the hot rotating gas cloud began to cool and contract, and if this were to happen the law of conservation of angular momentum requires a more rapid rate of rotation. This speed up was supposed to have flung off rings which condensed into the planets.

One problem with this hypothesis is that of angular momentum. With the vast majority of the system's mass accumulating at the center of the rotating cloud, the hypothesis predicts that the vast majority of the system's angular momentum should accumulate there as well. However, the Sun's rotation is far slower than expected, and the planets, despite accounting for less than 1 percent of the system's mass, thus account for more than 90 percent of its angular momentum. One resolution of this problem is that dust grains in the original disc created drag which slowed down the rotation in the center.

More recently protoplanet hypothesis for star and solar system formation have been attempted after the discovery that "empty" space contains considerable hydrogen, helium and dust. The dust resembles terrestrial compounds---silicon compounds, iron oxides, ice crystals, and even some organic molecules. So why not imagine the condensation of a "proto-sun" eventually collapsing under the pull of gravity, heating and eventually igniting in the now-familiar nuclear burning process by which hydrogen is compacted to form helium with the release of vast amounts of energy? The gases of space end up mostly in the sun, somehow, and the dust particles in the terrestrial planets by some kind of wondrous separation mechanism.

Answer 2

About 10 billion years ago a massive star exploded.
The rocky material that was produced at it's core was ejected at a very high speed.
It crashed into the wall of the hydrogen field [that spawned the massive star]
The cigar shaped ejecta slowed at the front causing a gigantic smoke ring,that evolved into the solar system.

Answer 3

a large gas cloud with some heavier elements mixed in(all from earlier stars that went supernova eons and eons ago)condensed forming our sun, as well as the planets in orbit of our sun approx 4.5billion years ago.

Answer 4

there are a lot of theories. there is the cloud dust theory and well the most accepted... the Big bang