The boat videos show that refraction of light is not completely understood, not that the Earth is flat. The atmosphere does slowly leak into space, but it happens extremely slowly because gravity is so strong. My personal opinion (I am familiar with the science and literature) on dark matter is that it doesn't exist. The classical theory of gravity is incomplete. The arms of a spiral galaxy should spin slower if the classic theory of gravity is complete. Jewish satanists and retards make up shit like "dark matter" when physics has incompleteness or a wrong prediction. "Spiral galaxies have a form inconsistent with our theory of gravity? OK, there must be invisible unobservable matter causing the discrepancy." The more intuitive way of phrasing the same idea is that God made gravity much more complex than we understand it currently. https://astrobites.org/2020/08/17/the-alternative-to-dark-matter-may-be-general-relativity-itself/