The ultra-low-density planet Kepler-51d is surrounded by the thickest layer of haze found on a planet yet, according to a new study that used NASA’s James Webb Space Telescope to take a deeper look at the “super-puff” planet. The haze makes discerning the chemical elements in the planet’s atmosphere — and any clues to the planet’s formation — challenging. Credit: NASA, ESA, and L. Hustak, J. Olmsted, D. Player and F. Summers (STScI) A newly studied exoplanet, Kepler-51d, is wrapped in an