what is dragon flying? The first explorers on distant moons will be robots, including a helicopter bound for Titan. Going back in time to see what Earth was like billions of years ago could answer some questions about why ours is the only planet of its kind in the solar system and how life began. Ancient rocks and fossils of early, simple life forms have provided some information. But if we could explore, today, another world that was similar, at least in some ways, to the young Earth, what might we learn about the way life formed and evolved? Titan, the largest of Saturn’s 62 known moons, offers an opportunity to do just that. The atmosphere is closer to that which Earth experienced billions of years ago. It’s about 95% nitrogen and 5% methane, with small amounts of other carbon-rich compounds. It is much colder, though, with a temperature around -290°F. The terrain is made up of vast expanses of organic-covered surfaces consisting of dunes, rocks, and rivers and lakes of liquid...
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