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Okies pple, now i go chiong info le ^^. Ok, so on supernovae... everyone always think that its a big bang rite? Type II Supernovae are formed when a massive star around or more than 3x our sun's mass (O.O) starts to run outta hydrogen to fusion into helium, so it starts to fuse helium to lithium, berylium, and when it runs outta helium, it keeps on going. Yes, fusing lithium and so on down the periodic table. Ok, then the star will stop fusing at iron. For beginners, the star prevents collapse under its own gravity by fusing elements into heavier elements, therefore the heat produced will keep the star balanced, or gravitational energy in the stars = energy produced by nuclear fusion(heat and light), therefore the star remains stable. When a star reaches the stage fusing iron, it cannot do it anymore(dunno why eh, go wiki learn ba XD), therefore the mass of the star collapses under its own gravity, and nuclear fusion cannot support its collapse, so the outer layers shrink to the core and crushing everything into the density of an atomic nucleus, then it rebounds backwards into space, causing a brilliant explosion called a supernova. Here i shall show some sizes of big stars and supernova remnants:) For that, i think i should end this lesson 1 then^^. Signing off! Zong Yang=P
Within a massive, evolved star (a) the onion-layered shells of elements undergo fusion, forming an iron core (b) that reaches Chandrasekhar-mass and starts to collapse. The inner part of the core is compressed into neutrons (c), causing infalling material to bounce (d) and form an outward-propagating shock front (red). The shock starts to stall (e), but it is re-invigorated by neutrino interaction. The surrounding material is blasted away (f), leaving only a degenerate remnant.(source from wikipedia)
The onion-like layers of a massive, evolved star just prior to core collapse. (Not to scale.)
Multiwavelength X-ray, infrared, and optical compilation image of Kepler's Supernova Remnant, SN 1604. (Chandra X-ray Observatory)
stargazing again at[4/05/2008 10:02:00 PM]
