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And it's interesting, looking back, if you look back at the Apollo astronauts, they were really fortunate to have been able to avoid a lot of these adverse space weather events prior to the moon landings. That was right from the beginning of the moon landings right through to the final mission, which was in 1972. And there wasn't a giant solar energy particle event during one of those extra-curricular activity time periods when they were outside, and they only had their space suits on. And those space suits at the time wouldn't offer much protection from being hit by all those particles at the energy level.