The most common type of planet discovered in the Milky Way may be a world that does not exist in our solar system — larger than Earth, smaller than Neptune, and wrapped in an atmosphere we barely unde

The Solar System gives us a familiar catalogue of planets: small rocky worlds close to the Sun, then gas and ice giants farther out. For a long time, that local inventory shaped the imagination. A planet could be Earth-like, Mars-like, Jupiter-like, ... [6948 chars]