Some journal articles available.
i say black holes are the most intresting phase of a red supergiant star.
Well, you could say that J20gU3, but black holes are not a "phase" of a red supergiant star.
u have start - can't mabe the next one - supergiant - red supergiant - nuteron star and if big enough black hole.
No, no,... Supergiant stars are not necessarily red, they can also be white or blue. The sequence must be supergiant (whatever colour it has)-neutron star-black hole. It's interesting to know that the first generation of stars (Population III stars, that had zero-metallicity) were supergiants
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