For years, scientists thought they had this planet figured out, small, rocky, and utterly inhospitable. But a closer look has flipped that assumption on its head.
TOI-561 b, a rocky exoplanet roughly twice the mass of Earth, orbits its host star at a blistering pace, about forty times closer than Mercury is to the Sun. Scientists long assumed that a world under such extreme conditions would be unable to retain... [3448 chars]