Hubble’s Dark Patch Reveals a Crowded Cosmos: 3,000 Galaxies in a Tiny Sky

In 1995, the Hubble Space Telescope fixed its gaze on a seemingly empty patch of sky for ten days, assembling hundreds of exposures into the Hubble Deep Field and turning a void into a crowded image of roughly 3,000 distant galaxies—each billions of years old—demonstrating that the universe is full of structure even in directions that appear empty and paving the way for deeper surveys with Hubble and Webb.