Spock's Blood...

[Therin of Andor]

JJ didn't care about the details that count, like correctly colored sky...

May I remind you of this day in Sydney, Australia, last year?

The scene from my back porch at breakfast time. The sky stayed red until about 3pm.

Welcome to Vulcan.

 

[KobayashiMaru13]

^ If we can have that here on Earth, then certainly that could be a daily thing on Vulcan?

 

[Therin of Andor]

^ If we can have that here on Earth, then certainly that could be a daily thing on Vulcan?

Eeeriest day of my life. There was so much red iron oxide suspended in the air that it stripped out the colour blue from the usual spectrum of colours. Everything looked bizarre, all day.

 

[finnobrit]

I think the crux of the question, and it's a valid one, is: given that a mother and the baby in her womb literally share the same blood during gestation, how could a human woman with red, iron-based blood carry an alien fetus with green, copper-based blood?

The baby doesn't share the same blood as the mother, they're separate systems, they can even have different blood groups.

The placenta allows the baby's blood to pass close to the mother's blood in order to exchange waste and nutrients. But the baby itself is technically a foreign body inside the mother, and has to suppress the mother's immune response to avoid being rejected by the mother's body.