James Webb Telescope Uncovers Cause of Unusual Pink Hue on Exoplanet GJ504b

• June 24, 2026

Located approximately 57 light-years from Earth, the exoplanet GJ504b orbits a star similar to the Sun and has intrigued astronomers since its discovery in 2013 due to its distinct pink coloration. Despite extensive observations conducted from Earth over the years, the cause behind this unusual atmospheric hue remained elusive.

James Webb Telescope Sheds New Light on GJ504b’s Atmosphere

Recent observations by the James Webb Space Telescope (JWST) provided a breakthrough in understanding the planet’s distinctive color. Within just two hours of targeted observation, the space-based observatory was able to determine that the pinkish tint of GJ504b’s atmosphere is primarily caused by the presence of salt-based clouds.

These saline clouds are atypical in the atmospheres of exoplanets and offer new insights into atmospheric composition and weather phenomena on planets beyond our solar system. The discovery highlights the capabilities of the JWST in probing atmospheric conditions with greater sensitivity and detail than ground-based telescopes.

GJ504b’s orbit around a star resembling the Sun adds to the significance of this finding, as it provides a valuable comparative model for studying planetary atmospheres in conditions somewhat analogous to our own solar environment.

The understanding of exoplanet atmospheres is critical for furthering knowledge about planet formation and potential habitability. Identifying chemical compositions and cloud formations extends the scope of exoplanetary science and informs future observation strategies for characterizing distant worlds.

While the exact implications of saline clouds in planetary atmospheres are still being explored, this discovery underscores the importance of space-based telescopes like the JWST in advancing our grasp of extraterrestrial environments. Enhanced study of planets such as GJ504b continues to enrich the scientific community’s insight into the diversity and complexity of planetary systems in our galaxy.

No detailed information was provided on the next steps for observing GJ504b or similar exoplanets, but ongoing use of advanced telescopes promises to deepen understanding of atmospheric phenomena in the cosmos.

The James Webb Telescope identified salty clouds as the source of the unusual pink color of exoplanet GJ504b, located 57 light-years away.