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A red giant star.
Red giant is a type of star.
A red giant star is a dying star that is in the last stages of stellar evolution. Red giant stars are red in color.
Betelgeuse is a red giant.
Its justa red giant or supergiant
No, it is a Yellow Giant
Red giants. By the way, what if it was a white star.
A star turns into a red giant when it lose fuel and die. If a star isn't a massive star then it expands into a red giant. After that it becomes a white dwarf. If its massive then it collapses on itself and turns into a black hole.
A Red Giant/Supergiant/Hypergiant, depending on its size.
The answer to this question is yes. It can vary, but not very much. Yet, the red giant is the coolest star.
A star that has exhausted the hydrogen in its core will become a red giant or supergiant.
It is the mass of the main sequence star. "High mass" stars can become supergiants (not always red). If you go into more details, you will find this answer is a simplification, but it's OK for most purposes.