Stellar Objects

Main sequence stars are in the stable, longest phase of stellar life, fusing hydrogen into helium in their cores.

Open clusters are loose groups of 100-1,000 young stars born together from the same molecular cloud, weakly gravitationa...

A red giant is an evolved star that has exhausted core hydrogen and expanded dramatically while cooling, fusing hydrogen...

A star is a self-luminous sphere of plasma held together by gravity, generating energy through nuclear fusion in its cor...