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xkcd #2886: Fast Radio Bursts
(imgs.xkcd.com)
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https://explainxkcd.com/2886
I don't know why but that [citation needed] caught me so off guard and made me laugh far too much
I'm fairly sure microwaves float in space. I don't think there are completely different laws of physics, just for microwaves. A microwave in a bistro however...
Microwaves travel through space at the speed of light because they are photons