take a look at this though. reporter: atlantis and the crew of four are ready to make history minutes from now with the last liftoff of the u.s. space shuttle. it is at that moment when it is finally over that you will be able to exhale, and take a breath and understand the significance of the moment. reporter: but americans have been fascinated with space exploration for decades. i believe this nation should commit itself to achieving the goal before this decade is out of landing a man on the moon. reporter: the first generation of astronauts became our national heroes. one giant leap for mankind. reporter: the mission that followed broke down barriers on earth and beyond. nasa made the unimaginable happen before our very eyes. four return attempts and not reporting any ref at this time. reporter: and unspeakable tragedy may have marred this program, but americans still feel pride and patriotism when we hear the countdown. zero and liftoff. reporter: