Larger than the planet Mercury, Titan is the only moon in the solar system with a thick atmosphere and stable bodies of surface liquid (methane and ethane).
By the 1840s, the search for the phantom planet had become the "Holy Grail" of astronomy. It was a problem that required a brain capable of逆向-engineering the universe. Two men, working independently and unaware of the other's progress, took up the challenge: John Couch Adams in England and Urbain Jean Joseph Le Verrier in France. planet 6
Many astronomers believe we are within a decade—perhaps even just a few years—of confirming or refuting the existence of Planet 6. Larger than the planet Mercury, Titan is the
The letter from Le Verrier arrived in Berlin on the evening of September 23, 1846. Galle received permission from the observatory director to look for the planet. He was aided by a young student, Heinrich d'Arrest. Two men, working independently and unaware of the
