Planets may start forming before their stars are even done

Planets may begin forming much earlier than scientists once believed during the final stages of a star s birth, not afterward. This bold new model, backed by simulations from researchers at SwRI, could solve a long-standing mystery: why so many exoplanet systems have tight clusters of similarly sized planets orbiting close to their stars. These compact systems seem to emerge naturally if planets start forming amid the swirling chaos of gas and dust still feeding the star.

source https://www.sciencedaily.com/releases/2025/06/250609121632.htm