Because they have very short lifespans - millions instead of billions of years, and thus they have been and gone.
Giant and supergiant stars are rare because they represent later stages in the life cycle of a star, which are shorter in duration compared to the main sequence phase. Additionally, the formation of giant and supergiant stars requires a massive initial stellar mass, which is less common in the universe.
Super giants are more massive and have larger radii than giant stars. Super giants are in a more advanced stage of stellar evolution compared to giant stars. Both types of stars eventually exhaust their nuclear fuel and go on to evolve into other stages, such as supernovae or white dwarfs.
Some of the SUPER GIANT stars are Sirius,Sun,Rigel,Betelgeuse,and procyon.
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The five main groups of stars are main sequence stars, giant stars, supergiant stars, white dwarf stars, and neutron stars. These groups are classified based on their size, temperature, and stage in their life cycle.
because giant and supergiant stage is very short
Giant and supergiant stars are rare because they represent later stages in the life cycle of a star, which are shorter in duration compared to the main sequence phase. Additionally, the formation of giant and supergiant stars requires a massive initial stellar mass, which is less common in the universe.
betelgeuse
Hot.
Hot.
KY Cyngnii
They are big stars.
Super giants are more massive and have larger radii than giant stars. Super giants are in a more advanced stage of stellar evolution compared to giant stars. Both types of stars eventually exhaust their nuclear fuel and go on to evolve into other stages, such as supernovae or white dwarfs.
Big huge stars
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Some examples of supergiant stars are Rigel, Deneb and Betelgeuse.
Some of the SUPER GIANT stars are Sirius,Sun,Rigel,Betelgeuse,and procyon.