How can we see the light from a very distant galaxy?

When astronomers observe a supernova explosion in a distant galaxy they see a sudden simultaneous rise in visible light and other forms of electromagnetic radiation?

  • Answer:

    Actually before the rise of visible light there is a surge in neutrinos that can give a warning of a super-nova by as much as five days. Then comes the light flash in all forms of electromagnetic radiation (including visible light).

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