I already admit confirmation bias.
You show confirmation bias yourself, when you type "hundreds of astronauts...with their pictures of space," with absolutely no facts to back to back that statement up.
Most RE-adherents won't though, so its nothing new.
I am curious, do you believe people have been to the top of Mt. Everest? I assume you have never been to the summit yourself to verify it exists.
Why believe mountain climbers, but not astronauts?
How can you tell which group is lying and which is telling the truth?
We have already had similar dialogue earlier.
You are writing of an earth-bound scenario, attempting to compare it to something to which I nor you have potential access.
I can travel (if wish) to the Hindu Kush, Karakoram, Himalayan, ranges, and witness the summits.
I'm using my confirmation bias, the same way you use yours.
Pardon me if this offends you.
On second thought, don't pardon me.
Own your emotions and/or sensibilities and ask,"Why would I allow the different opinion someone has regarding the legitimacy of photographs affect me so much that I must spend days arguing that it is and must be illegitimate?"
I'm not offended, I wouldn't care what you think normally, but you are using your opinion to tell others that pictures from space are fake and astronauts are liars.
Once you do this, then you have to back those statements up.
If you simply want to say "I believe the world is flat" that is fine, but the moment you start calling others wrong, and claiming things as fact, then you need to explain your reasons or provide evidence.
Asking questions like I did is the entire reason for this thread, it's why we are both here, is it not?
So back to the discussion, yes you could get to Mt Everest with a lot of work, but you could also reach the edge of space and see the curve with a lot of work. Both would take money and physical conditioning, but there is no reason you could not do both.