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NASA's Astronomy Picture of the Day featured a Webb NIRCam deep-field mosaic of Abell 2744, better known as Pandora's Cluster.
The cluster lies about 3.5 billion light-years away and is understood as a merger of multiple massive galaxy clusters. Webb's infrared view also captures background galaxies magnified by gravitational lensing.
The technology angle is the combination of infrared sensitivity, large-scale image mosaicking and lensing physics, which turns massive clusters into natural telescopes for studying the distant universe.
Why It Matters
Deep-field Webb observations use both engineering and cosmic gravity to reveal galaxies that would otherwise be too faint or distant to study.
What to Watch
Watch follow-up catalogues from Webb deep-field programmes and lensing-based studies of early galaxy formation.
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