Archive for August 27th, 2017

Sirius A+B


(Syfy Wire::Bad Astronomy) – Phil Plait:

Sirius B is the burned-out core of a star that was once much like the sun, though more massive. It likely started out life as a 5.6 solar mass star, putting it in the top tiers of “normal” stars. Something like 130 million years ago it ran out of useable hydrogen in its core to fuse into helium. It swelled up into a red giant, blew off its outer layers, and eventually all that was left was its dense inert core — the white dwarf we see today. …

syfy why-so-sirius

Sirius A+B