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The Action of the dying Sun
Why does the sun expand out as far as Jupiter before it contracts all
the way back to becoming a White Dwarf? Our sun would end up as a neutron star if it had 50% more mass. A star with to much mass is not beneficial for life. I don't think rock planets could form if their sun only lasted for 100 million years. Lets go with that supermassive star Eta Carinae it had a giant outburst,and released as much energy as a supernova. This star is still around. Hmmmm How did it survive that explosion? Astronomers estimate its mass to be 100 times that of the sun. With that mass it should end up as a blackhole. It could be the seed for another mini-bang that will reach a critical mass,and the moment it stops spinning its horizon will collape into the core,and release its singularity. to create a mirror image of the universe it was recycled from.(I love that idea) Bert |
#2
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"G=EMC^2 Glazier" ha scritto nel messaggio
... Why does the sun expand out as far as Jupiter before it contracts all the way back to becoming a White Dwarf? Our sun would end up as a neutron star if it had 50% more mass. A star with to much mass is not beneficial for life. I don't think rock planets could form if their sun only lasted for 100 million years. Lets go with that supermassive star Eta Carinae it had a giant outburst,and released as much energy as a supernova. This star is still around. Hmmmm How did it survive that explosion? Astronomers estimate its mass to be 100 times that of the sun. With that mass it should end up as a blackhole. It could be the seed for another mini-bang that will reach a critical mass,and the moment it stops spinning its horizon will collape into the core,and release its singularity. to create a mirror image of the universe it was recycled from.(I love that idea) Bert What about if Eta Carinae will become a gravastar? Or this theory is completely wrong? Luigi Caselli |
#3
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"G=EMC^2 Glazier" wrote in message
... Why does the sun expand out as far as Jupiter before it contracts all the way back to becoming a White Dwarf? Our sun would end up as a neutron star if it had 50% more mass. "The stars that eventually become neutron stars are thought to start out with about 15 to 30 times the mass of our sun." http://www.astro.umd.edu/~miller/nstar.html#formation A star with to much mass is not beneficial for life. I don't think rock planets could form if their sun only lasted for 100 million years. Lets go with that supermassive star Eta Carinae it had a giant outburst,and released as much energy as a supernova. This star is still around. Hmmmm How did it survive that explosion? Astronomers estimate its mass to be 100 times that of the sun. With that mass it should end up as a blackhole. It could be the seed for another mini-bang that will reach a critical mass,and the moment it stops spinning its horizon will collape into the core,and release its singularity. to create a mirror image of the universe it was recycled from.(I love that idea) Bert |
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Hi Casselli I never heard of a "gravastar" Sounds interesting please
explain. Bert |
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JohnZ Read that book again. In my book (just studied it),and it tells
me a star with 1.4 mass greater than the sun would end up as a neurton star. However JohnZ we should stop throwing books at each other,and discuss things. You started it so you have to end it.. My books are heavier than yours,and I can add more pages to it for sure. Bert |
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"G=EMC^2 Glazier" wrote in message
... JohnZ Read that book again. In my book (just studied it),and it tells me a star with 1.4 mass greater than the sun would end up as a neurton star. However JohnZ we should stop throwing books at each other,and discuss things. You started it so you have to end it.. My books are heavier than yours,and I can add more pages to it for sure. Bert Nonsense. Your "Heavy Books" probably say something like "a Neutron Star is about 1.4 solar masses". A Neutron Star does not contain the entire mass of its progenitor. I suggest you take a closer look at your "Heavy Books". |
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"G=EMC^2 Glazier" wrote in message
... JohnZ Read that book again. In my book (just studied it),and it tells me a star with 1.4 mass greater than the sun would end up as a neurton star. "It is believed that the remnant of a core collapse SN is a neutron star if the mass of the progenitor is less than ~ 20-25M(Sun) [80, 78]. If the progenitor's mass is in the range 20-25 ~ M ~ 40-50M(Sun), not the entire star is ejected in the SN explosion. More than 2M(Sun) will fall back onto the nascent neutron star and lead to black hole formation. If the progenitor's mass exceeds roughly 40-50M(Sun), then no explosion will occur and the star will collapse directly to a black hole. These objects are known as collapsars. However, it is unclear if high metallicity stars with M ~ 40-50M(Sun) actually end their lives in collapse or are prevented from doing so by stellar wind driven mass loss [78]. Note that the limits on the progenitor masses quoted in this paragraph (especially the 40-45M(Sun), lower limit for direct black hole formation) are uncertain because the progenitor mass dependence of the neutrino explosion mechanism (see below) is unknown [88, 150]." http://www.emis.de/journals/LRG/Arti...new/node9.html However JohnZ we should stop throwing books at each other,and discuss things. You started it so you have to end it.. My books are heavier than yours,and I can add more pages to it for sure. Bert |
#8
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JohnZ Using far less words than you because the books I read come
right to the point. The Chandrasekhar mass is roughly 1.4 suns,and just above this limit gravity squeezes the electrons and protons together. We call this density a neutron star. Yes I do have the book and page number. Well I do know a neutron star has 3 times less mass than a blackhole. So that might help your saying 40 times a sun mass.(hopefully) JohnZ why do you have to always be negative? Bert |
#9
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"G=EMC^2 Glazier" wrote in message
... JohnZ Using far less words than you because the books I read come right to the point. The Chandrasekhar mass is roughly 1.4 suns,and just above this limit gravity squeezes the electrons and protons together. We call this density a neutron star. Yes I do have the book and page number. Well I do know a neutron star has 3 times less mass than a blackhole. So that might help your saying 40 times a sun mass.(hopefully) JohnZ why do you have to always be negative? Bert A reminder of your original statement ... Our sun would end up as a neutron star if it had 50% more mass. This is simply untrue. A Main Sequence star with a mass below ~8M(Sun) is destined to end its life as a White Dwarf with a mass 1.4M(Sun). A Main Sequence star with a mass between ~8M(Sun) and ~20-25M(Sun) is destined to end its life as a Neutron Star with a mass between 1.4M(Sun) and ~2-3M(Sun). A Main Sequence star with a mass above ~20-25M(Sun) is destined to end its life as a Black Hole with a mass ~2-3M(Sun). Check your "Heavy Books" yet again. |
#10
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"G=EMC^2 Glazier" wrote in message ... Why does the sun expand out as far as Jupiter before it contracts all the way back to becoming a White Dwarf? Action / reaction. The core contracts inwards and the rest of the sun will have to go the other way. Over its lifetime, as the sun begins to sputter out just before it begins to go from burning hydrogen to helium, the sun's outer envelope will expand outwards as the core contracts. Eventually, when there is no further elemental burning possible for our sun, the core collapses to a pukey Neutron star and the rest of the sun just keeps expanding forever in the form of a planetary nebule. If you want to know more, get our alien friends in Regulus to e-mail you some pretty pictures of other stars that end their life with not a bang but a whimper. Greysky www.allocations.cc Learn how to build a FTL radio. |
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