Life Cycle of A Star

The life cycle of a star

Category:

Education

Tags:

• Life
• cycle
• of
• star

[ManiacMike77]

ur dumb

[puncheex]

... A couple of important results: most of those shells are blasted out into space, and in the heat of the explosion the heavier elements, too heavy to be created by burning, are created by overwhelming force and heat and pressure. The outer layers, which were never fused at all, perhaps 60% of the star, mostly hydrogen, also are forced out. The shock waves might cause turbulence in clouds of gas and dust, so as well as seeding them it causes them to start condensing into other stars.

[puncheex]

... Ultimately, if there is enough mass, you'll have a series of shells of fusion going an, hydrogen on the outside and iron being formed on the inside. If the iron core gets to about 1.4 solar masses, it implodes into neutronium under the pressure, and the shells around it collapse into the vacuum, and upon hitting then neutronium surface rebound outwards: a class II supernova. There are more details about neutrinos, and that burning to iron only lasts a couple of days. ...

[puncheex]

Not bad, but there are several important things that are not quite right. Of course, we are still learning more about it almost daily.

The sun burns hydrogen in it's core. As it exhausts fuel, that burning moves outward into a shell around the core; since there is more volume burning, the star heats up gradually. When the burning gets to a certain radius, it slows because of density drop, and the star contracts, making enough heat at the center to start helium burning. ...