Zack nods just a little at the estimate and then again at the mention of life support though this time it's accompanied by furrowed brows. He looks down at his own suit now with that pinched expression, giving it a prod here and a pinch there. Wincing when he manages to pinch himself through the suit.

"For being something for 'life support', it sure is thin..." he mutters, more to himself than anything. "But I guess they did say going out to space without something might'a been pretty dangerous. Guess it's not too farfetched to think that would include other planets."

Still, he can't help but start to do stretches here and there and... everywhere for kicks. Maybe it's just a little easier to focus on that, too. "Sure is flexible."