We've already seen the breathtaking first image released by the James Webb Space Telescope (JWST). And if you thought that pristine view of thousands of galaxies was impressive, get excited, because we're about to get some more.
– virtually the toddler years for our 13.8 billion year old Universe. This is all thanks to its huge primary mirror and ability to see the ancient, stretched-out infrared light of distant space.
Because the Universe is expanding, light from those very first stars shifts from the ultraviolet and visible wavelengths into the longer infrared wavelengths – which JWST can detect in never-before-seen detail."If you think about that, this is farther than humanity has ever looked before," Nelson said during aJWST was launched in December last year and is now orbiting the Sun a million miles away from Earth.
SMACS 0723 is a particularly good target for this sort of observation, because there are massive clusters of galaxies in the foreground. These act like a giant cosmic magnifying glass. Because of the immense mass, their gravity causes pronounced curvature of the space-time around them, with the effect of magnifying light from more distant objects.
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