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Join a live astronomical discussion exploring NASA's groundbreaking JWST discovery of potential evidence for a Saturn-mass gas giant orbiting Alpha Centauri A, humanity's nearest solar twin located just 4 light-years away. Learn from astronomers Franck Marchis from the SETI Institute and Julien Girard from the Space Telescope Science Institute as they break down the revolutionary observations that detected this planet candidate using JWST's MIRI coronagraph technology to suppress starlight and reveal faint planetary signals. Discover how the candidate planet orbits within the habitable zone at approximately 1-2 AU from its star, explore the orbital dynamics that may explain why the planet "vanished" from subsequent observations due to its elliptical orbit motion, and understand the significance of potentially imaging the closest gas giant in a habitable zone around a Sun-like star. Examine the advanced telescope techniques employed in this detection, discuss the implications for future exoplanet imaging capabilities, and learn about planned follow-up observations scheduled for 2026-2027 that could confirm this extraordinary discovery and advance our understanding of planetary systems around nearby stars.
