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Sirius, our brightest <b style="color:black;background-color:#ffff66">star</b>, is orbited by a white dwarf т?? a dead <b style="color:black;background-color:#ffff66">star</b>'s core. Where is the planetary nebula that would have formed when it shed its skin? | Astronomy.com

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Sirius, our brightest star, is orbited by a white dwarf т?? a dead star's core. Where is the planetary nebula that would have formed when it shed its skin?

FROM THE September 2015 ISSUE

Sirius, our brightest star, is orbited by a white dwarf т?? a dead star's core. Where is the planetary nebula that would have formed when it shed its skin?

Mark Socha, Saginaw, Minnesota

Published: Monday, July 27, 2015

RELATED TOPICS: STARS | WHITE DWARFS

The constellation Canis Major, the Large Dog, is home to the night's brightest star, Sirius.

The white dwarf Sirius B probably would have had a planetary nebula around it at one point, long ago. The planetary nebula phase of stellar evolution is a short-lived phenomenon, astronomically speaking, generally lasting only about 50,000 years. Sirius B is estimated to be over 100 million years old, so any planetary nebula it might have had is long gone.

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