Just a week after its first images were shown to the world, the James Webb Space Telescope may have found a galaxy that existed 13.5 billion years ago, a scientist who analyzed the data said Wednesday. "We're potentially looking at the most distant starlight that anyone has ever seen."   Though GLASS-z13 existed in the earliest era of the Universe, its exact age remains unknown as it could have formed any time within the first 300 million years. The more distant o