How are gas giant exoplanets born? James Webb Space Telescope provides new clues
The three inner planets orbiting the star HR 8799 were captured by JWST in 2023. Spectral analysis detected hydrogen sulfide in the atmosphere of HR 8799 c, indicating the massive planet formed through core accretion. (Image credit: Jean-Baptiste Ruffio, Jerry Xuan et al.) Astronomers may have just pushed the upper size limit of what counts asContinue Reading












