The biggest planet orbiting TRAPPIST-1 doesn’t appear to have an atmosphere
The finding raises questions about atmospheres around the cooler planets in the system
![An illustration of an orange planet with dark orange and red spots scattered across its surface.](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2023/03/032423_SP_trappist_feat.jpg?fit=1030%2C580&ssl=1)
Exoplanet TRAPPIST-1b (illustrated), which circles a star nearly 40 light-years from Earth, probably has little or no atmosphere, a new study suggests.
JPL-Caltech/NASA