Exoplanet TRAPPIST-1 b might have a hazy atmosphere

View larger. | Artist’s illustration of TRAPPIST-1 b as it is about to pass behind its red dwarf star. A new study suggested that TRAPPIST-1 b is either airless but very geologically active, or has a hazy carbon dioxide atmosphere. Image via Thomas Müller (HdA/ MPIA/ Max Planck Society).

• TRAPPIST-1 b is the innermost rocky exoplanet in the TRAPPIST-1 planetary system. Like the other six planets, it’s about the same size as Earth.
• Does TRAPPIST-1 b have an atmosphere? Previous observations...