COSMIC TIME MACHINE

Because even light has a speed limit, powerful telescopes can act as cosmic time machines, allowing astronomers to look back across the history of the Universe. This map from the Sloan Digital Sky Survey charts relatively nearby galaxies and galaxy clusters (yellow) and more distant but bright quasars (red) in terms of their ‘lookback time’ – the amount of time their light has travelled to reach us. Between the most distant quasars and the ‘cosmic dark age’ before galaxies began to form lies the mysterious zone of galaxies whose light has been stretched beyond the visible range – the region now being probed by the Webb.…

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All About Space Annual (Digital) - 1 Issue, All About Space Annual (2024)

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