Moondream · open weights ★★★ original
The biggest known planet outside of our solar system is a gas giant named GJ 667 Cc — a world so massive that it's larger than Neptune but too small for gravitational tugs from nearby stars to pull it off its orbit. This makes it a unique exoplanet with an unusually stable environment, notable for being one of the few confirmed planets to have water on its surface, hinting at possible habitability in its distant past.