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Jun 16, 2020 at 11:03 history edited CommunityBot
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May 27, 2020 at 21:16 comment added HDE 226868 @ChristopherJamesHuff All excellent points.
May 27, 2020 at 21:16 history edited HDE 226868 CC BY-SA 4.0
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May 27, 2020 at 20:03 comment added Christopher James Huff Lasers would also be impossible, and astrophysical masers wouldn't happen (en.wikipedia.org/wiki/Astrophysical_maser). Spectral lines, if they were produced at all, wouldn't be subject to Doppler effects...not just overall redshift, you also wouldn't get line splitting from rotating sources or line broadening from the motion of individual atoms. They'd basically have to simulate a universe with physical laws matching our local region and somehow present us with a view that matches that simulated universe across the EM spectrum and in neutrino and gravitational radiation.
May 27, 2020 at 16:43 history edited HDE 226868 CC BY-SA 4.0
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May 27, 2020 at 15:23 history answered HDE 226868 CC BY-SA 4.0