Are There Any Challenges in Spaceflight?

There are some things, definitely on the life support side of the technologies that still need to be overcome. There's just some redundancies we have to put in place if we want to take those approaches for our lifes upport architectures. So i would say radiation is a pretty big one. We've been doing a fantastic job in terms of water. We got a little bit to do still in nutrient cycle, but that's just, again, improving efficent. It really comes down to the resources that we needwe we have available to us.