How can a young blue giant have a white dwarf companion star that’s billions of years older?

Sirius is a blue giant, which burns through its fuel quickly and lives only a relatively short period of time. Yet it has a white dwarf companion (Sirius B) and white dwarfs are the end result of stars like our Sun, which live for billions of years. How can a young blue giant have a Continue reading "How can a young blue giant have a white dwarf companion star that’s billions of years older?" The post How can a young blue giant have a white dwarf companion star that’s billions of years older? appeared first on Astronomy Magazine .

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