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NASA's Webb Delivers Deepest Infrared Image of Universe Yet
Scientific India
|July-August 2022
NASA's James Webb Space Telescope has delivered the deepest and sharpest infrared image of the distant universe so far.
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Webb's First Deep Field is galaxy cluster SMACS 0723, and it is teeming with thousands of galaxies - including the faintest objects ever observed in the infrared.
Webb's image is approximately the size of a grain of sand held at arm's length, a tiny sliver of the vast universe. The combined mass of this galaxy cluster acts as a gravitational lens, magnifying more distant galaxies, including some seen when the universe was less than a billion years old. This deep field, taken by Webb's Near-Infrared Camera (NIRCam), is a composite made from images at different wavelengths, totaling 12.5 hours achieving depths at infrared wavelengths beyond the Hubble Space Telescope's deepest fields, which took weeks. And this is only the beginning. Researchers will continue to use Webb to take longer exposures, revealing more of our vast universe.
This story is from the July-August 2022 edition of Scientific India.
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