Of all the solar system’s planets, Mercury is an oddball. But wait, there’s more: it only holds onto a radiation belt less than half the time. Still, the point is that, like other planets, Mercury has a radiation belt. But, like other planets, its innate features and environment affect how that radiation belt manifests. For spaceflight operatives, radiation belts can be pesky obstacles for managing spacecraft (and astronauts, if they’re crewed).