Greenbelt, Maryland, USA · 12 July 2022 — NASA, in partnership with the European Space Agency (ESA) and the Canadian Space Agency (CSA), released the first full-colour images and spectroscopic data from the James Webb Space Telescope (JWST) on 12 July 2022, following a preview of the first image — Webb's First Deep Field — unveiled by U.S. President Joe Biden at a White House event on 11 July. The release marked the official beginning of the telescope's science mission after a six-month commissioning period in orbit around the second Sun-Earth Lagrange point (L2), approximately 1.5 million kilometres from Earth.
The five targets selected for the first release were chosen to demonstrate the breadth of Webb's scientific capabilities: from the deepest infrared image of the early universe to the atmospheric composition of a distant exoplanet.
Webb's First Deep Field: SMACS 0723
The first image released, known as 'Webb's First Deep Field,' is an infrared view of the galaxy cluster SMACS J0723.3-7327. Captured by Webb's Near-Infrared Camera (NIRCam), the image combines exposures totalling 12.5 hours — achieving depths at infrared wavelengths beyond the Hubble Space Telescope's deepest fields, which took weeks of observation.
The cluster, located approximately 4.6 billion light-years away, acts as a gravitational lens, bending and magnifying the light of galaxies located far behind it. The image reveals thousands of galaxies, including some of the faintest objects ever observed in infrared light. Some of the lensed galaxies appear as they were over 13 billion years ago, offering a view of the universe in its infancy.
The Carina Nebula: Cosmic Cliffs
Webb's image of the Carina Nebula, one of the largest and brightest nebulae in the sky, revealed a landscape of 'cosmic cliffs' — the edge of a giant gaseous cavity within the star-forming region NGC 3324. The cavernous structure, approximately 7,600 light-years from Earth, had been largely obscured by dust in previous visible-light observations.
Webb's infrared vision penetrated the dust to reveal previously hidden, nascent stars forming within the molecular cloud. The image shows stellar winds and intense ultraviolet radiation from massive young stars sculpting the surrounding gas and dust into towering pillars, some as tall as 7 light-years.
Stephan's Quintet: Galactic Interactions
The image of Stephan's Quintet, a visual grouping of five galaxies in the constellation Pegasus, provided astronomers with a 'ringside seat' to observe galactic interactions and mergers. Four of the five galaxies are engaged in a gravitational dance, with repeated close encounters triggering bursts of star formation.
Webb's Mid-Infrared Instrument (MIRI) captured a view showing one galaxy, NGC 7318B, passing through the cluster, generating shockwaves that heat interstellar gas and dust. The image also revealed bright clumps of star formation triggered by the gravitational interactions, and a previously unseen halo of stars surrounding the galaxy NGC 7317.
Southern Ring Nebula: A Dying Star
Webb imaged the Southern Ring Nebula (NGC 3132), an expanding cloud of gas ejected by a dying star approximately 2,500 light-years from Earth. The telescope captured the nebula in two infrared wavelengths using both NIRCam and MIRI, revealing for the first time that the star at the centre of the nebula is actually a binary system — two stars orbiting each other, with the dimmer white dwarf responsible for ejecting the surrounding gas.
The MIRI image, in particular, showed the second star in full view for the first time, surrounded by a shell of dust that indicates a series of pulses in the star's final stages of evolution.
WASP-96 b: Exoplanet Atmospheric Signature
Webb's spectroscopic observation of the hot gas giant exoplanet WASP-96 b demonstrated the telescope's ability to characterise exoplanet atmospheres with unprecedented precision. Located approximately 1,150 light-years away, WASP-96 b orbits its star every 3.4 days and is roughly half the mass of Jupiter.
Using the Near-Infrared Imager and Slitless Spectrograph (NIRISS), Webb captured the most detailed measurements to date of starlight filtering through the planet's atmosphere during a transit — when the planet passes in front of its star from the telescope's perspective. The resulting transmission spectrum revealed the clear signature of water vapour, along with evidence of clouds and haze.
The Telescope and Its Instruments
The James Webb Space Telescope launched on 25 December 2021 aboard an Ariane 5 rocket from the Guiana Space Centre in Kourou, French Guiana. The $10 billion observatory is the largest space telescope ever built, with a 6.5-metre primary mirror composed of 18 hexagonal beryllium segments coated in gold. The mirror collects infrared light — radiation beyond the visible spectrum that penetrates dust clouds and reveals the thermal emission of cool objects.
Webb operates with four primary instruments:
| Instrument | Capability | Partner |
|---|---|---|
| NIRCam | Near-infrared imaging (0.6–5 microns) | University of Arizona / Lockheed Martin |
| NIRSpec | Near-infrared spectroscopy (0.6–5 microns) | ESA / NASA |
| MIRI | Mid-infrared imaging and spectroscopy (5–28 microns) | ESA / NASA / JPL |
| NIRISS | Near-infrared imaging and slitless spectroscopy | CSA |
The telescope's sunshield, a five-layer tennis-court-sized structure, keeps the instruments at approximately -233°C (40 K), enabling the sensitive infrared detectors to function without interference from the telescope's own thermal emission.
Commissioning and Early Science
The six-month commissioning period following launch involved the precise deployment of the sunshield and mirror segments, alignment of the 18 hexagonal mirrors to act as a single optical surface, and calibration of the four science instruments. Each step was executed remotely, with no possibility of in-orbit servicing given the telescope's distance from Earth.
By the time of the first image release, Webb had already begun its Cycle 1 science programme, which includes observations by astronomers worldwide through competitively awarded proposals. Early science targets range from the first galaxies in the universe to the formation of stars and planetary systems, and the characterisation of exoplanet atmospheres.
Implications for Astronomy
The first images confirmed that Webb's optical performance exceeds its design specifications. The telescope's image sharpness — measured as 'strehl ratio' — was better than 0.8 at 2 microns, meaning over 80 per cent of the light from a point source is concentrated into the central pixel. This exceeds the pre-launch requirement of 0.7 and approaches the theoretical diffraction limit.
For the astronomical community, the release marked the beginning of a new era of infrared exploration. Webb's ability to observe the universe at wavelengths inaccessible to Hubble opens windows into the formation of the first galaxies after the Big Bang, the birth of stars and planetary systems inside dusty molecular clouds, and the atmospheric chemistry of worlds beyond the solar system.
The first observations are already yielding scientific results. Follow-up analysis of SMACS 0723 identified galaxies with redshifts exceeding z=10, corresponding to light emitted less than 500 million years after the Big Bang. Spectroscopic observations of these distant galaxies are providing the first detailed measurements of their chemical compositions and stellar populations.
Sources:
- NASA, President Biden Reveals First Image from James Webb Space Telescope, 11 July 2022
- ESA/Webb, Webb's First Images Revealed, 12 July 2022
- NASA Goddard Space Flight Center, James Webb Space Telescope First Images Broadcast, 12 July 2022
- Space.com, James Webb Space Telescope's 1st stunning photos are here, 12 July 2022
- STScI, Webb Science Mission Begins, July 2022
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