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Tom Mazanec
2015-Aug-14, 04:24 PM
How does a Jupiter form?
From a "seed" protoplanet that accretes gas from the solar nebula?
From a part of the solar nebula which collapses into a gas giant, like a companion star forming?
From several smaller protoplantets colliding and merging?
Some other way?

BigDon
2015-Aug-14, 04:27 PM
Sometimes it's pinched off in a process similar to what makes binary stars.

Cougar
2015-Aug-20, 02:46 PM
How does a Jupiter form?
From a "seed" protoplanet that accretes gas from the solar nebula?
From a part of the solar nebula which collapses into a gas giant, like a companion star forming?
From several smaller protoplantets colliding and merging?
Some other way?

It was previously thought that dust and ice grains coalesced slowly to form kilometre-scale objects that then combined until they were big enough to hold onto a gaseous cloak. This model had problems, though. An article in today's Nature, August 20th, strengthens support for the idea that centimeter-sized primordial pebbles rapidly melded into the cores of gas giants. Interactions "would have flung some of these protoplanets out of the plane of the dusty disk, effectively starving them of material; those remaining in the disk could gorge on pebbles to become true planets...."