Oooh someone who actually went to the ISS -- I guess if you were a Flat Earther we'd call you insane.
A few questions:
Part 1 -- easy explanations, please
1. What do you think about the Flat Earth hypothesis that the Sun is 32 miles wide and 3000 miles above the Earth? What evidence do you think is most convincing to Flat Earthers? I've tried the nuclear fusion argument but that got derailed very quickly (some flatties proposed that the Sun burns hydrogen with oxygen and others said it was ... electric smh).
2. Can you explain in a simple way why the existence of the International Space Station proves the roundness of the Earth without resorting to photographic evidence? (The orbit)
3. Can you describe an easy-to-conduct experiment that would prove the existence of gravity as opposed to universal acceleration (and the 10000 other different forces that FE people invent to account for observed differences by latitude, orbits of celestial bodies, the Cavendish experiment, Foucault pendulums, etc)?
4. Can you explain concisely to a bunch of flatties why aircraft don't have to account for the curvature of the Earth?
Part 2 -- opinion-based
5. Why do you think people like those in the Flat Earth Society distrust scientists and science so much? Is it their fault, or is science just that hard to grasp?
6. Why do you think is the best way to remedy such ignorance?
7. Do you think the Flat Earth movement is just a more extreme manifestation of science denial that takes place in society today (anti-vaxxers, evolution, homeopathy, climate change, etc)?
8. Does it make you disappointed/angry when people who don't know anything about basic physics/math/chemistry (Tom Bishop, a "Zetetic Council Member," has asserted that pi = 4, 2+2 \neq 4, garlic cures cancer, that Foucault pendulums are affected by the distant stars, and that centripetal acceleration at the equator isn't normal to the Earth's surface) call the work that NASA does fake?
9. What's the best way to convey the magnitude, complexities, and specialization of current scientific work, so that these people realize that the trivial disproofs they come up with have already been thought of and debunked decades ago?
10. What's the best career path from undergraduate student to flying in space?
Also, I'll sum up a lot of FE theory for you, so we don't get the inevitable person spouting garbage about how you didn't address their arguments:
1. The Earth is a flat non-spinning disk with the azimuthal equidistant projection of the globe representing reality (although they can't agree on a map, this is the model they refer to).
2. Gravity doesn't exist; the Earth is accelerating in a direction normal to its surface known as "up" at 9.8 m/s^2.
3. The observed variations in gravitational acceleration come from a proposed form of "gravitation" (which is different from gravity; just think of the flatties' definition of "gravitation" as "invisible ").
4. All forms of the Coriolis effect are caused by some other form of "gravitation" produced by the stars, and they won't debate this with you.
5. The Sun, Moon, and any manmade satellites (if they acknowledge them, since there's a rift about this) orbit in circles above the Earth.
6. We are "shielded" from the invisible acceleration by the Earth's mass. By Einstein's equivalence principle, this and #2 mean that we can think of ourselves as the only things in Earth's neighborhood affected by an invisible "downward" force.
7. There is no curvature of the horizon (even if there is)
8. All of the occlusions of the buildings and ships and other such things are due to "perspective" and/or "distortion" (although it has been demonstrated that the lead flatties know nothing about optics)
9. The horizon always stays at eye level (blatantly false)
10. We see further as we get higher up because of "perspective," "distortion," or "particulates" (more in lower parts) in the atmosphere.
11. Day and night are because the Sun has a magical lampshade that casts a "spotlight" on Earth.
12. NASA photos are fake.
13. Amateur rocketry uses "fisheye" lenses that make the Earth appear to be curved.
14. They don't understand spherical geometry, so the distance/angles argument is still a work in progress.