Astronomy 2021A/B Lecture Notes - Lecture 11: Escape Velocity, Electron Transport Chain, Europa Europa
4 Oct 2017
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Built his own homemade telescopes in 1609. 1610 galileo found the four large moons of jupiter. The galilean moons: io, europa, ganymede, callisto. Come in a wide range of sizes. Two largest: ganymede (jupiter) and titan (saturn) Almost all of the moderate-size and large moons orbit their planets in much the same way that planets orbit the sun. Obit nearly in the equatorial plane of their hose world. Move in the same direction as their planets spin. Suggests they were formed in a smaller-scale version of the same processes that gave birth to the planets. Gas and dust formed a swirling disk-shapes cloud around each jovian planet. Condensation and accretion built moons that shared the orbital properties of the original disks of gas and dust. Most have irregular shape, less gravity too weak to force the rigid material into spheres. May be fragments of larger moons that broke apart.
