The light you're seeing is old. The galaxy that sent it? Long gone.
Take the most distant light we can detect. It left its source when the universe was extremely young — a fraction of its current age. You might expect that source to be roughly 13.8 billion light-years away. It isn't. It's now about 46 billion light-years from us, and the full observable sphere stretches to around 93 billion light-years across. How? Space itself expanded while the light was travelling. The galaxy wasn't moving through space — space was stretching beneath it, carrying it further with every passing moment. What we see in the sky is a frozen snapshot of where things were, not where they are. The whole observable universe is our cosmic horizon. Beyond it, there may be far more — possibly without limit. Follow Deep Field Vault for more of the universe's stranger truths.