00:00A major solar storm can massively increase radiation levels within minutes. And that's
00:06exactly what would be the most acute risk for a Mars crew. Apollo was only outside the magnetic
00:12field for a few days. A flight to Mars takes about six to nine months one way, then a stay
00:17on the
00:17surface and another six to nine months back. So we're talking about one to three years in deep
00:22space. And at that point a quick flyby strategy won't help you anymore. But how much radiation
00:27are we talking about on a Mars mission? Thanks to Curiosity and Perseverance, two of NASA's
00:33rovers on the red planet, we know that pretty precisely. The radiation dose on a typical Mars
00:38flight is about 0.6 to one Sievert per year. For comparison, an Apollo astronaut only received a few
00:46millisieverts.
