Using the James Webb Space Telescope, scientists have peered back into ancient galaxies that existed when the universe was only 300 to 400 million years old—presenting new mysteries about how the universe evolved
Multiple teams are using JWST to peer into the primordial murk, where ancient galaxies could reveal new insights into the creation story of the universe. That story begins with a bang some 13.7 billion years ago, and the stars and planets and people that populate the universe today are the products of billions and billions of years of cosmic evolution. But their roots are planted in cosmic infancy, hidden behind a veil of dust.
“There are an awful lot of them—too many, too big, too bright, too hot, too mature, and too soon,” NASA’sPeering through space and time As light travels through an expanding cosmos, it’s stretched to longer, redder wavelengths. Astronomers can measure the extent of that stretch, called redshift, which can be used to calculate an object’s distance. Higher redshifts mean an object is farther away.
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