NASA's Space Place: A Two-Toned Wonder from the Saturnian Outskirts

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By Dr. Ethan Siegel  --  Although Saturn has been known as long as humans have been watching the night sky, it's only since the invention of the telescope that we've learned about the rings and moons of this giant, gaseous world. You might know that the largest of Saturn's moons is Titan, the second largest moon in the entire Solar System, discovered by Christiaan Huygens in 1655.