Formation and evolution of the solar system
There is evidence that the formation of the Solar System began about 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud.Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets.
Ideas concerning the origin and fate of the world date from the earliest known writings; however, for almost all of that time, there was no attempt to link such theories to the.
The planets were originally thought to have formed in or near their current orbits. This has been questioned during the last 20 years. Currently, many planetary scientists think that the Solar System might have looked very different after its initial formation:.
Astronomers estimate that the current state of the Solar System will not change drastically until the Sun has fused almost all the hydrogen fuel.
The Solar System travels alone through the Milky Way in a circular orbit approximately 30,000 light years from the . Its speed is about 220 km/s. The period required for the Solar System to complete one revolution around the Galactic.
Presolar nebulaThe nebular hypothesis says that the Solar System formed from theof.
Moons have come to exist around most planets and many other Solar System bodies. Theseoriginated by one of three possible mechanisms:• Co-formation from a circumplanetary disc (only in the cases of the giant planets);• Formation.
The time frame of the Solar System's formation has been determined using . Scientists estimate that the Solar System is 4.6 billion years old. The
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