Since
the beginning of time man has been fascinated with space. It was only relatively
recently that man has been able to explore what we have always been so curious
about. Ideas have changed through time about Earth and the universe. It
was only forty years ago that man first left the gravity of Earth. Today,
probes are more than seven billion miles away from Earth. In the short time
that man has been in space, we have learned so much about the universe,
but we also have more questions now than we had even before we ventured
into the unknown space.
