The James Webb Space Telescope (JWST) is a space telescope developed by NASA with contributions from the European Space Agency (ESA), and the Canadian Space Agency (CSA). JWST was launched on 25 December 2021 on Ariane flight VA256.

It is designed to provide improved infrared resolution and sensitivity over Hubble, and will enable a broad range of investigations across the fields of astronomy and cosmology, including observations of some of the most distant events and objects in the Universe such as the formation of the first galaxies, and allowing detailed atmospheric characterization of potentially habitable exoplanets.

The James Webb Space Telescope has a mass about half of Hubble Space Telescope's, but its primary mirror, a 6.5 m (21 ft)-diameter gold-coated beryllium reflector has a collecting area over six times as large, 25.4 m2 (273 sq ft), using 18 hexagonal mirrors with 0.9 m2 (9.7 sq ft) obscuration for the secondary support struts.

Webb will be the premier observatory of the next decade, serving thousands of astronomers worldwide. It will study every phase in the history of our Universe, ranging from the first luminous glows after the Big Bang, to the formation of solar systems capable of supporting life on planets like Earth, to the evolution of our own Solar System.

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