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New Information on Sirius A and B

I just came across an interesting blog post on Sirius.  Among other things, the age of Sirius A is now estimated at 237 to 247 million years and Sirius B (the white dwarf companion) at 228 million years, with an uncertainty of about ten million years for each star.  Surprisingly, Sirius B is estimated to have begun the transition from a normal star to a white dwarf about 130 million years ago, which would mean it was only about a hundred million years old at the time.

This piece is written by Phil Plait, who writes a blog entitled Bad Astronomy.  Here’s the link:

Why so Sirus?

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