The Most Powerful Space Observatory Ever Built
The James Webb Space Telescope (JWST) is the world's largest and most powerful space observatory. Designed primarily to observe the Universe in infrared light, JWST enables astronomers to study the first galaxies, the birth of stars and planets, the atmospheres of exoplanets, and many other astronomical phenomena with unprecedented detail.
The telescope is an international collaboration between NASA, the European Space Agency (ESA) and the Canadian Space Agency (CSA). It was named in honour of James E. Webb, NASA Administrator from 1961 to 1968.
The LinkedIn Group Aerospace Engineering Innovation has been created to connect the people interested in the aerospace field. You can also link to the LinkedIn profile Aerospace Engineer.
| Property | Value |
|---|---|
| Official Name | James Webb Space Telescope (JWST) |
| Launch Date | 25 December 2021 |
| Launch Vehicle | Ariane 5 |
| Launch Site | Guiana Space Centre, French Guiana |
| Primary Mirror Diameter | 6.5 metres |
| Mirror Segments | 18 gold-coated beryllium segments |
| Operating Orbit | Sun-Earth Lagrange Point L2 (about 1.5 million km from Earth) |
| Primary Wavelength | Near and Mid Infrared |
The James Webb Space Telescope was conceived during the 1990s as the successor to the Hubble Space Telescope. Its goal was to observe deeper into space and further back in time than ever before.
Following decades of engineering development and testing, JWST was launched successfully on Christmas Day 2021. During the following month, the spacecraft unfolded its mirrors and five-layer sunshield before entering its operational orbit around the Sun-Earth L2 point.
| Instrument | Purpose |
|---|---|
| NIRCam | Near-infrared imaging and wavefront sensing. |
| NIRSpec | Near-infrared spectroscopy of hundreds of objects simultaneously. |
| MIRI | Mid-infrared imaging and spectroscopy. |
| FGS/NIRISS | Fine guidance, exoplanet spectroscopy and imaging. |
JWST has detected some of the earliest known galaxies, allowing astronomers to study the Universe only a few hundred million years after the Big Bang.
Infrared observations reveal stars forming inside dense clouds of gas and dust that are invisible to optical telescopes.
The telescope has analysed the atmospheres of numerous exoplanets, detecting molecules such as water vapour, carbon dioxide, methane and other chemical compounds.
JWST has produced detailed observations of Jupiter, Saturn, Uranus, Neptune, asteroids and comets, providing new insights into planetary atmospheres and weather systems.
| Feature | James Webb | Hubble |
|---|---|---|
| Primary Mirror | 6.5 m | 2.4 m |
| Main Wavelength | Infrared | Visible & Ultraviolet |
| Orbit | Sun-Earth L2 | Low Earth Orbit |
| Launch | 2021 | 1990 |
| Serviceable by Astronauts | No | Yes |
The James Webb Space Telescope is expected to continue operating for well over a decade. Future observations will investigate the first generation of galaxies, the formation of planetary systems, the chemistry of exoplanet atmospheres, and the evolution of the Universe from the Big Bang to the present day.