Glossary term: Red Giant
Description: A red giant is a star that was originally a dwarf star like the Sun, which has run out of hydrogen fuel, and expanded as it changes to helium or heavier elements for fuel. It is typically 100 or more times larger and more powerful than the Sun, so life on Earth will not survive when the Sun reaches this late stage of stellar evolution, billions of years from now. Examples of red giants are Arcturus, in Bootes, and Mira, in Cetus. Red giants are unstable to pulsation (in-and-out vibration) and can vary in brightness by a factor of 1000, as Mira does.Related Terms:
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Term and definition status: This term and its definition is still awaiting approval
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