Bob Greschke wrote:

But Sirius IS big enough, AND it's big enough, AND it will go off someday.
Then we may just be toast.


Sirius A is only 2.3 solar masses and will not go supernova. Instead it
will become a red giant, but does not orbit close enough to its companion,
Sirius B, a white dwarf to for gas to fall onto the little bugger and create
a Type Ia supernova. Sirius A will eventually become a white dwarf like its
companion that preceded it. This is what will happen to our sun too.