How does the radius of a Red Supergiant, like Betelgeuse, generally compare to the maximum expansion of a Red Giant like the future Sun?
Answer
Red Supergiants swell far beyond the Red Giant phase, often having a radius large enough to engulf the orbit of Jupiter
The difference in initial mass translates to vast differences in size; Red Giants might reach Mars' orbit, while Red Supergiants can expand by factors making them orders of magnitude larger, potentially surpassing Jupiter's orbit.
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How Do Stars Become Red Giants Or Supergiants? - Physics Frontier
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