James Webb Unveils Fourth 'Super-Puff' Planet in Kepler-51 System

Researchers have discovered a fourth planet in the Kepler-51 system, known for its three ultra-low density "super-puff" planets, using NASA's James Webb Space Telescope. This unexpected finding, revealed through transit timing variations, challenges existing models and raises new questions about the formation and characteristics of these rare planets. The discovery, detailed in the Astronomical Journal, suggests the new planet, Kepler-51e, may have a mass similar to the other planets and follows a circular orbit, though its exact nature remains uncertain.