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Webb Telescope Solves a 20-Year-Old Planetary Mystery Sparked by Hubble

The James Webb Space Telescope (JWST) has provided new insights into a 20-year-old mystery initially sparked by observations from the Hubble Space Telescope. The mystery involved the planet GJ 1214b, a mini-Neptune exoplanet, which appeared unusually reflective and had an unexpectedly flat spectrum, suggesting a high-altitude haze or cloud cover. Using its advanced infrared capabilities, JWST observed GJ 1214b during a secondary eclipse, where the planet passed behind its star, allowing scientists to isolate the planet's light. The observations revealed that GJ 1214b has a thick, reflective atmosphere composed mainly of water vapor, methane, and hydrogen, with possibly some clouds or haze. This atmosphere reflects a significant amount of starlight, explaining the planet's high albedo and flat spectrum. These findings not only solve the long-standing puzzle but also enhance our understanding of the atmospheric composition and behavior of mini-Neptunes, which are common in our galaxy but not found in our solar system.

Read the Full Gizmodo Article at:
[ https://gizmodo.com/webb-telescope-solves-a-20-year-old-planetary-mystery-sparked-by-hubble-2000542398 ]