The hazards that the Artemis II crew must navigate during their 10-day flight are plentiful, starting from the second they launch aboard the most powerful rocket to ever carry humans and continuing all the way through their return to Earth nestled inside the Orion capsule.
Many threats the crew will face are obvious, but not all of them are. Take, for example, radiation, which with moderate exposures can increase an astronaut’s long-term risk of cancer and with heavy doses can cause acute sickness. The Artemis II crew will be the first humans in decades to travel beyond low-Earth orbit, fully discarding the protection of Earth’s magnetic field. And while most aspects of cosmic radiation are straightforward to plan for, the outlier is space weather.
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