James Webb Space Telescope (JWST)

The James Webb Space Telescope (JWST) is the infrared observatory of NASA, ESA and the Canadian Space Agency. It launched on December 25, 2021, on an Ariane 5 from Kourou and reached the Sun-Earth L2 point, about 1.5 million km from Earth, on January 24, 2022. Its 6.5-meter mirror is made of 18 gold-coated beryllium segments behind a five-layer sunshield. Commissioning showed performance better than expected almost across the board, with enough propellant for more than 20 years.

Flagship instruments

• NIRCam: near-infrared camera.
• NIRSpec: near-infrared spectrograph.
• MIRI: mid-infrared camera and spectrograph.
• FGS/NIRISS: guidance sensor plus imager and slitless spectrograph.

Recent results

Webb made the first definitive detection of carbon dioxide in an exoplanet atmosphere (2022), found unexpectedly massive-looking red galaxies that led to the “little red dots,” confirmed galaxies at redshift 14 and caught a vigorous black hole in GN-z11 (2024). In January 2026 it set the distance record with MoM-z14, at redshift 14.44. Recent 2026 results include water and fresh dust next to the Milky Way’s black hole, a planet that survived its star’s death and the host galaxy of the most distant fast radio burst.

What to watch, 2026-2030

• July 2026 to June 2027: Cycle 5, 254 selected General Observer programs, including 225 with 8,009 hours of prime time.

Why scientists are converging here

Demand is at a record. Cycle 5 drew 2,930 proposals asking for 99,782 hours, about 12 times what was available, from 7,363 investigators at 849 institutions; 46% of selected proposals are led by first-time JWST principal investigators. In our Research Pulse count, “JWST” appeared in 939 astro-ph abstracts from April to September 2026, up 22% on the previous six months, and “little red dots” rose 52%. Mentions measure attention, not quality, but Webb is where the early universe, black holes and exoplanet atmospheres meet.