[mnehring]

Betelgeuse is expected to go super-nova very soon. If this happens, the sky that we look at could have two stars in it, even though Betelgeuse is 1,300 light years away.

Which means it either went supernova 1,300 years ago OR we won't have a 'new sun' until 1,300 years from now.

[Lonesome in Massachussets]

If a star goes supernova in the galaxy and no one sees it, does it emit light? I suppose he means, we may receive the light “any day now”. Not high on the list of things I’m going to worry about.