5,4,3,2,1, Lift off! This airline SpaceX will make more rocket engines than the rest of the U.S. production combined. That’s a lot of rocket engines. Space X has been really exciting and it has revolutionized the public’s interest in space exploration and rockets and sending humans back into space. Yeah well it is science fiction.
– [Narrator] Astronomers have found dozens of potentially habitable planets outside of our solar system. That’s dozens of chances to discover the first alien life. Or, you know, plenty of places we could park our first interstellar colonies. But with so many options, how do we know which is best? You might think that most