From the dawn of man until very recently, humans have been Earthbound, unable to reach even the clouds—let alone space. It's only within the last hundred years or so that the advent of manned flight and rocket ships has made the heavens attainable. In that time, we've sent people to the moon, rovers to Mars, and space probes deep into the reaches of our solar system. And advanced telescopes that orbit Earth are bringing even the most remote edges of the universe closer to home. See where space travel started, and where it's going.
More About Space Exploration
The U.S. space program has had its share of successes and setbacks. See some unforgettable images from the early days of space exploration as America set its sights toward the sky.
Since it was placed into orbit in April 1990, the Hubble Space Telescope has captured images and information that have transformed our understanding of the universe.
Since 1990, the Hubble Space Telescope has given the world a bonanza of breathtaking images of the universe. See what it takes to keep this celebrity telescope running like a top.
Over a brief three-year period, six U.S. astronaut crews landed on the moon, forging a new branch of space exploration. Follow in their famous footsteps.
'Live From Space' March 14
As California's drought endangers Chinook salmon, fisheries officials release 600,000 baby salmon into the Sacramento River, triple the usual number, in hopes that many return to spawn. Video.