Definition of red giant in English:

red giant

Line breaks: red giant

noun

Astronomy
A very large star of high luminosity and low surface temperature. Red giants are thought to be in a late stage of evolution when no hydrogen remains in the core to fuel nuclear fusion.
More example sentences
  • When its fuel runs out, an old star expands into a red giant and then collapses to become a white dwarf.
  • Multiple collisions involving red giants and other stars might yield the random orbits her team has observed.
  • It is believed that eventually the sun will expand into a red giant, swallowing all of the inner planets, and destroying all life on earth.

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