When kittens are born, their eyes are sealed shut. The limit of their world is their mother's warm body. Before many weeks pass, however, not only do their eyes open, but their neighborhood expands, their muscles and senses begin to coordinate, and days of exciting exploration begin.
Humans are similar.
Moving away from our own warm mother earth, already we have come upon as many surprises as kittens in a kitchen. And we have only just begun our exploration of the universe. Let's look around and back now and see just what we have found out so far- and how we have managed to find it out. It wasn't easy. Finding out about our place in the universe that is.