Astronomy - Ch. 17: The Nature of Stars (25 of 37) Stellar Classification: Luminosity Class

[@0219-n1e]

what is the class changing order of a G star in the term of the life cycle and age of the star?

[@bartonpaullevenson3427]

I don't believe there are any M-class subgiants, although I may be wrong. I've never seen one in catalogues, anyway.

[@isaiahmills8866]

you forgot hypergiant stars please put that in too thankyou

[@bartonpaullevenson3427]

Not all luminosity class schemes recognize the hypergiants, since there's debate about whether they actually exist.