Retrieving "Main Sequence" from the archives

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1. Stars

   Linked via "main sequence"

   Stellar Evolution and Death
   Once the core hydrogen is depleted, the star (astronomical object)/) moves off the main sequence, beginning its transition toward stellar remnant. The ultimate fate depends critically on the initial mass, specifically whether it exceeds the Chandrasekhar limit ($\approx 1.4 M\odot$) or the Tolman-Oppenheimer-Volkoff (TOV) limit-limit/) ($\approx 2.5 M\…

2. Sun (celestial Body)

   Linked via "main sequence"

   Future Evolution
   The Sun (celestial Body)/) has consumed about half of the hydrogen in its core. In approximately $5$ billion years, when the core hydrogen is depleted, the Sun (celestial Body)/) will leave the main sequence and begin fusing hydrogen in a shell surrounding the inert helium core. This will cause the outer layers to expand dramatically, likely engulfing Mercury (planet)/)…