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1Lecture #10: Solar System Survey II•Distances and a Solar System Scale Model •Overview of Planetary AtmospheresTerrestrial Planet AtmospheresAstro 102/1041– Terrestrial Planet Atmospheres– Jupiter, Saturn, Uranus, NeptuneJupiter, Saturn, Uranus, Neptune•Overview of Solar System FormationAnnouncementsReview sessions:Sunday and MondayAstro 102/10427:30 pmBaker 135No office hours on MondayThe Main PointAll of the planets with atmospheres in lhdiiiAstro 102/1043our solar system have distinctive weatherand climate.Distances in the Solar System•The basic unit: Astronomical Unit (AU):–Defined as Earth's average distance from the Sun.–1 AU ≈150,000,000 km ≈93,000,000 miles.•Can also think of distances in light travel time:Astro 102/1044–Light travels at 300,000 km/sec.–1 AU = 150,000,000 km / (300,000 km/sec) = 500 sec.–Earth is a little over 8 “light minutes” from the Sun.–Neptune is more than 4 “light hours” from the Sun!–Nearest star (αCentauri) is ≈4.3 “light years” away!–Nearby galaxy (Andromeda) is 2.5 million light years away!
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