This is my view. I have relatives who worked with nasa and the science behind everything and research would be utterly pointless and stupid if there was not evidence of space. There is space and there is space radiation and they have to do all kinds of crazy shit unique to that environment that you would never do if it wasn't different than earth.

I am open to a dome but it would be a giant ass dome.

Also most flat earthers don't realize 99.9 percent of space missions never go into "space" so yes it looks weird when you look at the path of the rocket