Cosmic Time Machine: The Jaw-Dropping Science Unleashed by the James Webb Space Telescope
JWST launched December 25, 2021, aboard an Ariane 5 to the Sun-Earth L2 point, deploying a 6.5-meter segmented mirror and a five-layer sunshield. Within weeks, it detected water vapor on exoplanet WASP-96 b and later confirmed carbon dioxide on WASP-39 b. In 2023, JWST found methane and carbon dioxide on K2-18 b. The telescope has identified galaxies at redshifts z~12–14, less than 400 million years after the Big Bang.