Assertion: nebula's star | /r/HasProperty | red giant
Facets:
Source sentences:
text: The nebula was formed about 4,000 years ago, when the central star, a red giant, ejected a shell of ionized gas in the final stage of its evolution before becoming a white dwarf.
text: Unlike Sun-like stars that have huge numbers of smallish convection cells in their photospheres, red giant stars, as well as red supergiant stars have only a few very big convection cells.
text: Before its encounter with the black hole, the star was a red giant in the last stages of stellar evolution.
text: The central star in CRL2688 was a red giant a few hundred years ago.