ASTR 1110 book summary - ch.7.1

ASTR 1110 book summary - ch.7.1 - Astronomy Book Notes 7.1...

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Astronomy – Book Notes 7.1 Studying the Solar System - Comparative Planetology: The study of the solar system by examining and understanding the similarities and differences among worlds. What does the solar system look like? - All planets orbit the Sun in the same direction and in nearly the same plane - The four inner planets are much smaller and closer together than the next four planets. - Most of the planets have nearly circular orbits - Small white circles around all the planets except Mercury and Venus (which have no moons) show that most major moons orbit their planets in the same direction that their planets rotate. What are the major features of the Sun and planets? - The Sun: o Radius: 695,000 km = 108 R EARTH o Mass: 333,000 M EARTH o Composition (by mass): 98% hydrogen and helium, 2% other elements - Mercury o Average distance from the Sun: 0.39 AU o Radius: 2,440 km = 0.38 R EARTH o Mass: 0.055 M EARTH o Average density: 5.43 g/cm^3 o Composition: rocks, metals o Average surface temperature: 700 K (day), 100 K (night)
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ASTR 1110 book summary - ch.7.1 - Astronomy Book Notes 7.1...

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