Comments by "Sebastian Nolte" (@sebastiannolte1201) on "Professor Dave Explains" channel.

@tournesol99 "They believe the others are spherical, but not Earth. " No, that is not what they believe. Instead they don't believe that earth is a planet at all, nor other the other "planets". Thy think that the other planets are just lights on the firmament. Flat earth is a geocentric world view, where space does not exist. Earth is flat and stationary, the sun and moon are small and close (and both are just light sources and not physical bodies).
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