https://www.ncbi.nlm.nih.gov/pubmed/27721383 https://www.ncbi.nlm.nih.gov/pubmed/27721383 Good question! The answer is that we know so little about surviving t

https://www.ncbi.nlm.nih.gov/pubmed/27721383 https://www.ncbi.nlm.nih.gov/pubmed/27721383 Good question! The answer is that we know so little about surviving there for any appreciable length of time (compared to a human lifespan), that most don't understand the challenges. Meanwhile they're relative experts with the problems faced by a terrestrial existence. TL;DR The hydrogen is always redder in the other man's H-Alpha band.