I’m not saying it’s beyond possible, only that it’s not “easy”. If someone is saying that we can colonize Mars, it’s orders of magnitude easier to send the same

I’m not saying it’s beyond possible, only that it’s not “easy”. If someone is saying that we can colonize Mars, it’s orders of magnitude easier to send the same payload to Antarctica and see if it works somewhere that, say, a failure in the air processing system can avoid loss of life by opening the windows.