Intergalactic Voyages (Narration Only)
Science & Futurism with Isaac Arthur
00:00
Intergalactic Space - The Big Bang Era of Redshifted Photons
cosmic microwave background radiation. These are ancient photons that are the last relics of a period when the whole Universe was dense and hot enough that it was basically a star. As the Universe expanded we reached a critical tipping point where photons no longer got emitted and were nearly instantly reabsorbed, but instead tended to be able to travel uninterrupted. In many cases they never got reabsorbed even almost 14 billion years later to the present day. But if you are moving through space at say half the normal rate of time flow, then those CMB photons are going to blue shift back up by a factor of 2. And from just under 2mm wavelength to about 1mm and a frequency jump from 160
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