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20 April, 13:56

Which of the following is a likely life cycle of a star?

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  1. 20 April, 14:04
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    D.

    Explanation:

    But this just happen for big stars, like more than 20x the Sun mass.

    Shortly: A nebula is a cloud of gas and dust, the material starts to be acummuleted and became a protostar (is like a big planet, almost a star). With enought mass this is a star, burn hydrogen and transform it in Helium.

    This occurs in Main Sequence, is about almost all the life time of a star. Then starts the lack of hydrogen. Gravity compress everything, pressure goes up and heat all. Too much energy, Helium get burned and the star grews fast, became a Red Giant. Time pass and the fuel is over, no more making fusion, gravity compress the star, too much strenght, colapses, neutron star.

    If it have pretty mass, ok. If have more than like 2x Sun mass, became a blackhole.
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