- #1
Romulo Binuya
- 64
- 0
When media reports a supernova it sounds like it happened just a while ago despite the photon stream came from say 10 million light-years away. Is it approximately correct to tell the layman that actually that supernova happened 10 million years ago because it took that time for its light to reach us? I like to include time dilation and length contraction in the calculation of when exactly light started its journey away from a supernova. Unfortunately, I don't know yet how to calculate that :-D