James Webb Space Telescope Discovers Oldest Galaxies in History

The James Webb Space Telescope (JWST) has discovered the earliest and most distant galaxies confirmed to date, with light emitted by these galaxies more than 13.4 billion years ago. Four of these galaxies date back to less than 400 million years after the Big Bang, when the universe was only 2% of its current age. The galaxies were confirmed by obtaining long spectroscopic observations, which not only provide secure measurements of their distances, but also allow astronomers to characterize the physical properties of the galaxies.