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Originally posted by Phage
The solar system formed out of a cloud of dust and gas. As the cloud condensed and contracted due to its own gravity, the angular momentum of the material caused it to to form a disk. Clumps formed in the disk and turned into the planets. The Sun formed in the center of the disk. That is why all the planets are in about the same plane.
Originally posted by TeslaandLyne
Gravity acts from the center of the Sun.
Going too far from the plane of the equator of the Sun causes
the planets to realign with the equator.
Even though gravity acts from the center, we are told the imbalance
of going too far to the top is drawn back the the more massive
bottom the brings the planet back to the equatorial plane.
I would rather an electrical universe moment answer but I
don't know any.
I didn't check any of my astronomy books but I'm sure the
gravity answer should be what is in there.
Originally posted by mbkennel
Originally posted by TeslaandLyne
Gravity acts from the center of the Sun.
Going too far from the plane of the equator of the Sun causes
the planets to realign with the equator.
This is not true. The gravitational force from the Sun is radial and would not change this.
The previous poster was correct. The Solar system formed from an initial cloud of material which, by accident, had a net non-zero angular momentum.
Once you combine that fact, the conservation of momentum, and the clumping due to gravity you end up with objects with closely aligned orbital axes.
One might ask another, more fundamental question: why do planets all orbit in the same direction? Because they all got their original angular momentum from the same place and it hasn't ever gone away.
Even though gravity acts from the center, we are told the imbalance
of going too far to the top is drawn back the the more massive
bottom the brings the planet back to the equatorial plane.
Nope.
We have satellites around the Earth in polar orbits and equatorial orbits. The ones in polar orbits are not being pushed into equatorial orbits.
I would rather an electrical universe moment answer but I
don't know any.
I didn't check any of my astronomy books but I'm sure the
gravity answer should be what is in there.
Your astronomy books should have the right explanation in there.
Orbital Inclination (degrees) - The angle in degrees at which a planet orbits around the Sun is tilted relative to the ecliptic plane. The ecliptic plane is defined as the plane containing the Earth's orbit, so the Earth's inclination is 0.
Originally posted by Demonis
Seems to have nailed it. ^^
Originally posted by eyecatching
The planets are attracted by the gravity of the sun, but also one another.
This is why they tend to form a line within a plane. Some argue we'll lose Pluto if a body encroaches close enough, which would destabilize the Solar System. Others think we may pick up an extra planet that wanders in too close. Also, destabilizing the Solar System.
Originally posted by Phage
reply to post by n120by60w
The planets in other systems also orbit around their own stars in close to the same plane.
www.skyandtelescope.com...
Are you asking if all of the other planetary systems are in the same plane as the Solar System? There is no reason to think so. The plane of the Solar System is at an angle of about 60º to that of the Milky Way. The formation of planetary systems is independent of the galaxies in which they form so the plane of their orbits would tend to be random in relation to the galaxy.
Originally posted by ngchunter
reply to post by n120by60w
The planes are random, that's why it so rare to find another solar system whose plane is aligned close enough to ours for us to see its planets transiting the star. That's why the Kepler mission has such a huge sample size of stars to observe. Only a tiny percentage will show transiting planets, even if most of them do harbor other worlds.
Originally posted by spy66
To have gravity in space besides a magnetic force you need a atmosphere of some kind that can make them attract.