Lecture10 - Lecture#10 Solar System Survey II Distances and...

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1 Lecture #10: Solar System Survey II Distances and a Solar System Scale Model Overview of Planetary Atmospheres Terrestrial Planet Atmospheres Astro 102/104 1 – Terrestrial Planet Atmospheres – Jupiter, Saturn, Uranus, Neptune Jupiter, Saturn, Uranus, Neptune Overview of Solar System Formation Announcements Review sessions: Sunday and Monday Astro 102/104 2 7:30 pm Baker 135 No office hours on Monday The Main Point All of the planets with atmospheres in l h di i i Astro 102/104 3 our solar system have distinctive weather and 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 102/104 4 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 ( α Centauri) is 4.3 “light years” away! Nearby galaxy (Andromeda) is 2.5 million light years away!
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