"the glass is curved"

No, I'm not joking.

But the retina is curved too, so I am not sure there is even a way to convince flat-earthers?

But not on the ground.

It would also be easier to use a hot air balloon than a home-made rocket, but that wouldn't get you in the Washington Post, I guess.

There are buildings that go higher than 1,800 feet^. There are many kinds of vehicles that could complete this mission, with some available for charter at very affordable rates. This is all part of why this project is fantastic. It's nonsensical in an exciting way. I really hope he launches (and doesn't die). Hell, I hope he proves the earth is flat.

^ He does plan to go higher in future missions, just to be fair. This is not passive flat earthism. He's starting a flat earth space program, not being trapped on a disc forever.

> He does plan to go higher in future missions, just to be fair.

True. He may have to go a lot higher, in fact. The Flat Earth Society's FAQ claim that you would have to go higher than commercial airliners "to get even a hint of curvature if earth were round": https://wiki.tfes.org/Frequently_Asked_Questions#As_a_passen...

You’re going to need to take a step back and examine the situation before you apply any more of that reason.

Hmmm....

Perhaps those closest to him agreed to not tell him that was an option.