For decades, astronomers peered through the Hubble Space Telescope, searching for the "cosmic dawn"—the moment the first stars flickered to life. They found a faint smudge in the Hubble Ultra Deep Field, a galaxy later confirmed to exist at . To Hubble, it was just a ghostly hint, a pixelated whisper of the past.
), light from the earliest galaxies began a multi-billion-year journey toward Earth.
Here is a story of discovery centered on that distant frontier: The Echo of the First Stars For decades, astronomers peered through the Hubble Space
: Analysis of the light showed high amounts of ionized oxygen and hydrogen, signaling that the first generations of stars had already begun "seeding" the universe with the elements necessary for future planets and life.
When JWST finally turned its gold-plated mirrors toward the same patch of sky, the "8.7z" galaxy was no longer a mystery. The data revealed: ), light from the earliest galaxies began a
: Even in the universe's youth, these galaxies were forming stars at incredible rates.
In the vast expanse of the cosmos, "8.7z" refers to a point in time so distant that the universe was only about 600 million years old—a mere infant compared to its current age. At this (notated as The data revealed: : Even in the universe's
: Surprisingly, JWST found more of these distant galaxies than anyone expected. This suggests the early universe was much more efficient at creating light and structure than our old models predicted.