Originally posted by TheRepublic
reply to post by The Real Antichrist
why does uranus rotate on its side while all other plantes rotate right side up? why is neptune and saturn right side up and uranus sideways? what happend in its evolution to cause this?
Originally posted by The Real Antichrist
LOL honestly, I do not know. I'm assuming some kind of pole reversal, maybe?
- The solar system formed 4.6 Ga when interstellar material in a spiral arm of the Milky Way Galaxy condensed and collapsed. Under the influence of gravity this material flattened into a counterclockwise rotating disk.
- 90% mass is concentrated in the center with rest occurring in solar nebula.
- Compression at the center raised T > 106 K. Sun formed when H/He burning initiated.
- Turbulence/eddies in solar nebula led to formation of planetismals.
- Anomalous rotation directions/axis tilts explained by collisions between planetismals as planets formed*.
- Compositional variation among planets is related to distance from Sun - Hot inner portion of nebula, rock and metallic elements condensed out first, at high T. Result: inner planets are "terrestrial" in composition.
- Outer portion of nebula is cooler, so gaseous phases such as H, He, methane, ammonia condensed out. Result outer planets are "Jovian" in composition.
- Sun's magnetic field interacted strongly with ionized nebular gases - resulted in loss of solar rotational speed.
- Early in life, Sun emitted a large blast which blew away uncondensed material.
- Asteroid belt formed because tremendous gravitational field of Jupiter prevented planetismals from accreting into a planet.