Maybe I'm missing something here

But I was under the impression that information cannot travel faster than light

Typically, they occur when a massive star - more than eight times the mass of the Sun - runs out of fuel and collapses to form a hot relic called a neutron star.

Their extreme brightness allows them to be seen in distant galaxies.

But observers cannot pick up this optical emission until several hours or days after the explosion, so a supernova's first moments are shrouded in mystery.

I thought Proxima Centauri was the closest star at 4.2 light years. If it were to pop, it would take 4.2 years before we knew it, right?

posted by by Robb Allen @
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