Well without getting into too large of a physics lecture. It's basically because the radiation is everywhere in the universe. This certain type of radiation isn't just an anomally, it's all around all the time buzzing at about 5 or 6 kelvin.
Scientists can calculate the energy loss from the radiation to pinpoint when the explosion were to occur based on the total emitted energy in the universe from the radiation.
It's an example of using actual evidence to create a theory.
Unfortunately I don't have any evidence to bring a credible theory that the flying spaghetti monster exists.
That's the difference. Science vs. un-science.
And that's the debate. I don't want un-science being taught to children because it's nothingness. It's whatever some crackpot cooks up. Today it's God, tomorrow Flying Spaghetti monsters, yesterday it was Eugenics and then it was genocide.
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