Rank 19 documents the James Webb Space Telescope — the infrared flagship that succeeded Hubble at Sun–Earth L2, carrying a 6.5-metre segmented gold mirror, five-layer Kapton sunshield, and instruments NIRCam, MIRI, and NIRSpec across wavelengths from 0.6 to 28.5 micrometres. Launched 25 December 2021 aboard Ariane 5 ECA from Kourou, JWST completed a multi-week deployment sequence more complex than any prior observatory before reaching its halo orbit 1.5 million kilometres sunward of Earth. John Mather's science vision and Gregory Robinson's program leadership delivered first light images in July 2022 — Carina Nebula star birth, exoplanet atmosphere spectra, and deep-field views that rewrote early-universe astronomy. Wallimilist renders the deployed hex mirror array, sunshield kite, Milky Way backdrop, L2 schematic, and navy JAMES WEBB SPACE TELESCOPE 2021 title exactly as the master PNG dictates — Ariane line, NGST lineage kicker, and curator copy on Great Observatories heritage.