From satellites to the moon, NASA has conducted dozens of successful missions to space. These are some of the most famous. We'll start with a look at NASA's first space station.
There's a lot more out there than our measly solar system, and astronomers are becoming more adept at finding those worlds all the time. Here are 10 of their coolest discoveries.
Not by a long shot, self-centered earthlings. So the question is, exactly how many Earth wannabes are cruising around the universe and what are they like?