Gavitational Lensing from Time Jewels by Jack Hertz

The first science image released by the James Webb Space Telescope (JWST) was of a gravitational lens, in particular the galaxy cluster SMACS J0723.3−7327. Gravitational lenses, especially galaxy clusters, magnify the light from background galaxies and produce multiple images of these. Before JWST, 19 multiple images of six background sources were known in SMACS J0723.3−7327. The JWST data now revealed 27 additional multiple images from another ten lensed sources.

Read more - https://www.mpg.de/19028990/0727-ext0-jwst-gravlens-155031-x

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