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whats the cycle of a star?

4 Answers

  • 2 years ago
    Favorite Answer

    All stars form from a great cloud of gas, called a nebula.

    Clumps form within the cloud, increasing in size and mass, pulling in more matter. As the matter continues to fall in, the core begins to heat, called a protostar.

    When the star begins fusing hydrogen into helium, the star is born - it begins it’s life on the Main sequence.

    For low-mass stars (like our sun), the life is generally quite long, and ends when the hydrogen begins to run low. The star will contract a bit, and the helium will briefly begin fusing into carbon, causing the star to swell into the Red Giant phase. After the outer layers are blown out, all that’s left is a white dwarf, which will cool slowly for billions of years.

    For higher mass stars, their lives on the main sequence ends when the star begins producing iron in their cores. Iron cannot be fused into heavier material *and* release energy - so, the star will stop fusing, suddenly. When this happens, the star collapses on itself, contracting in minutes; the sudden pressure on the core causes it to rebound, and the star explodes into a supernova.

    The result of the supernova could be a Neutron star, where the free electrons have been crushed into the protons of it’s atoms, producing a mass of nothing but neutrons. If the pressure is even greater, the mass could fall below the Schwarzchild limit, and it collapses into a singularity, producing a black hole.

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  • 2 years ago

    Magnetic cycle typical, the Sun has sunspot cycle every 11 years.

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  • Nyx
    Lv 7
    2 years ago
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