"Castle and Beckett don spacesuits and enter a Mars simulation to figure out how an astronaut ended up dead on Castle. "The Wrong Stuff" is the 16th episode of the show's seventh season."
Never watched the show so the above doesn't mean much to me but you don't get to a seventh series without doing something right.
Thanks to Tim for spotting this. We think these are the spacesuits from Ascension (2014). The helmets are not. Have these been around somewhere else? Lets play.......thoughts, guesses and confirmations into the comments, please.