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    Default Huge gamma-ray blast spotted 12.2 bln light-years from earth



    Dont gamma ray bursts come from collapsing stars?

    Dont stars typically live 10 billion years?

    I thought scientists estimated the age of the cosmos at around 14 billion years old.

    If a star lives 10 bilion years, then collapses, then it takes 12 billion years for the light from the colaps to get to our eyes, how can the cosmos be only 14 billion years old?

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    Stars like our sun live for around 10 billion years. Larger stars have much shorter lifespans and are more likely than our sun to undergo an explosive termination.
    Lets assume that the universe is 14 billion years old. That means that we will be able to see a gamma ray burst from any object that is 10 billion years old only if it is closer than 4 billion light years. If we see a gamma ray burst from a more distant object then that object would have to be younger.

 

 

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