How is Betelgeuse built?

Answer 1

Stars are formed when hydrogen molecular clouds collapse. The Sun, for example, is halfway through its main sequence evolution, during which nuclear fusion reactions in its core fuse hydrogen into helium. Stars without the mass to explode will enter the red giant phase, in which its outer layers expand as the hydrogen fuel in the core is consumed and the core contracts and heats up. Stars with more than about 10 solar masses after burning their hydrogen become red supergiants during their helium-burning phase. Betelgeuse is one such red supergiant and has formed in the same way.

Answer 2

Betelgeuse is a red supergiant star located in the constellation of Orion. It is believed to have formed through the nuclear fusion of hydrogen and helium within its core, eventually leading to its current state as a massive star nearing the end of its lifespan. The star's size and characteristics are a result of the balance between gravity pulling inward and nuclear fusion creating outward pressure.