Astronomers Find First Planet With Earth-Like Water And Weather Outside Our Solar System

Key Points:

• Astronomers have discovered that WISE 0855, a Jupiter-sized brown dwarf located about 7.5 light years from Earth, has water clouds with changing thickness, indicating progressive weather patterns unlike previously thought.
• Using the James Webb Space Telescope (JWST), the University of Arizona's Steward Observatory team observed WISE 0855 over 11 hours, capturing detailed spectra that revealed dynamic cloud movement and composition for the first time.
• Although WISE 0855 is not habitable and resembles Jupiter more than Earth, it is notable for being the coldest brown dwarf discovered and one of the closest substellar objects to our solar system.
• The JWST's advanced infrared capabilities allowed researchers to distinguish between clouds, chemistry, and temperature effects, providing unprecedented insight into the atmosphere of WISE 0855 compared to earlier photometry-based studies.
• This discovery marks a significant advancement in exoplanetary science, enabling detailed observation of atmospheric phenomena on nearby brown dwarfs and enhancing understanding of their physical characteristics.