Lizwi Posted November 5, 2019 Share Posted November 5, 2019 Why can't the Sun form a black? , because it can collapse too. Link to comment Share on other sites More sharing options...
zapatos Posted November 5, 2019 Share Posted November 5, 2019 4 minutes ago, Lizwi said: Why can't the Sun form a black? , because it can collapse too. The sun does not have enough mass to form a black hole. It would need to be roughly at least five times more massive than it is to form a black hole. 2 Link to comment Share on other sites More sharing options...
MigL Posted November 5, 2019 Share Posted November 5, 2019 (edited) The Sun cannot collapse because of radiation pressure. If nuclear processes in the Sun's center were to stop ( once enough iron accumulates in its center ), there will be a partial collapse to what is termed a white dwarf star. Further collapse is prevented by electron degeneracy pressure ( see the Pauli Exclusion Principle ), and that is how it will spend the remainder of its life. IF our Sun was a couple of times more massive, electron degeneracy could not stop the crush of gravity, and it would collapse even further, until neutron degeneracy would stop the collapse and our ( more massive ) Sun would then become a neutron star. IF our Sun was about ten times more massive, even neutron degeneracy could not stop further collapse. As a matter of fact we don't know of any mechanism that could stop the gravitational collapse of such a massive object. Gravity would squeeze it small enough that our best theories stop making sense , and we can't even investigate/observe because the universe throws up an event horizon around it that prevents any information coming back out. Edited November 5, 2019 by MigL 3 Link to comment Share on other sites More sharing options...
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