 And from solar wind radiation. You're going to have to protect them in some manner. It's the Van Allen Belt. Well, the Van Allen Belt is less of a problem because you're going to go through the Van Allen Belt very quickly. And the astronauts on Apollo did that, and it did not have any long-term effects of any significance. So the Van Allen Belt is less of a problem. It's really when you get out beyond them that you're exposed to cosmic rays and to other radiation that's much more lethal, especially from the sun. And so...