Dawn of the universe might have been bursting with galaxies now hidden by dust Artist impression of what the galaxy MAMBO-9 would look like in visible light. The galaxy is very dusty and it has yet to build most of its stars.
Studying galaxies in the night sky is an exercise in time travel, since the light we are seeing represents how things looked in the past, sometimes even billions of years ago. So studying the very farthest galaxies from us can clue us in on what the early universe was like