JWST
The James Webb Space Telescope (JWST) is a space-based infrared observatory developed through international collaboration between NASA, the European Space Agency (ESA), and the Canadian Space Agency (CSA). Launched on December 25, 2021, it succeeded the Hubble Space Telescope as humanity’s primary space-based observatory for astronomical research. The telescope operates at the Sun-Earth L2 Lagrange point, approximately 1.5 million kilometers from Earth, where gravitational mechanics allow it to maintain a stable orbital position relative to both bodies.
Design and Capabilities
JWST observes primarily in the infrared spectrum, enabling it to detect light from the earliest galaxies and most distant astronomical objects. Its 6.5-meter segmented primary mirror, composed of beryllium segments coated with gold, is significantly larger than Hubble’s 2.4-meter mirror. The instrument’s infrared sensitivity allows it to penetrate cosmic dust and observe objects obscured from visible-light telescopes, making it particularly suited for studying the primordial universe and the formation of galaxies, stars, and planetary systems.
Scientific Objectives
The observatory was designed to address fundamental questions in cosmology and astronomy, including the formation of the first galaxies after the Big Bang, the evolution of galaxies over cosmic time, star and planetary system formation, and the atmospheric composition of exoplanets. Its observations have already contributed to discoveries across these research areas since commencing full operations in mid-2022.