Does nuclear fusion in our sun require any energy to sustain/start?
2016-01-20 6:01 pm
Would gravity that keeps the reaction going be considered energy or a force... So then the reaction takes no energy to sustain other than the fuel correct? Explain if it uses energy from gravity or not to sustain, I'm still fuzzy on this. Explain plz.
回答 (1)
2016-01-20 6:14 pm
To get started, gravity is required to get the fusion process hot enough (and dense enough) to begin.
Once started, gravity provides the force that keeps the density of the plasma high enough to counter the outward forces being released by nuclear fusion. It becomes a balancing act -- the energy released by the fusion wants to blow the sun apart while gravity wants it all to collapse on top of itself. The sun continues to fuse as long as gravity has the upper hand but, eventually, if there is too much fusion the sun will go nova (or supernova) -- while if there is too much mass, gravity wins and the atoms collapse into a neutron core.
Once started, gravity provides the force that keeps the density of the plasma high enough to counter the outward forces being released by nuclear fusion. It becomes a balancing act -- the energy released by the fusion wants to blow the sun apart while gravity wants it all to collapse on top of itself. The sun continues to fuse as long as gravity has the upper hand but, eventually, if there is too much fusion the sun will go nova (or supernova) -- while if there is too much mass, gravity wins and the atoms collapse into a neutron core.
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