I am not going to judge this show based on if it's scientifically right, if it's realistic, if it's technically right, etc. No Manned Ship has travelled this far so every writer has complete freedom to frame it the way he or she wants to. It makes no sense for us to say whether it's realistic or scientifically right or not.
I love this show because I understand it's more about us, humans. It's about who we are. It's about sacrifices, it's about love and its about everything that a human is or does.
This show is beautiful in many ways. I'll suggest you to watch it.