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Orbiting Our Sun All of the planets in our solar system revolve around our Sun. Today you will investigate the speeds at which they move around.

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**Orbital distance = 2 x 3.14 x 148,800,000 km**

Orbital distance per day = km = 2,560,000 km Orbital speed per hour = km/h = 107,000 km/h

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**The Moon Orbital period = 28 days Distance from Earth = 384,000 km**

Orbital distance = 2 x 3.14 x 384,000 = 2,411,520 km Orbital distance per day = km = 86,136 km Orbital speed per hour = km/h = 3589 km/h This is 1 km/s

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**Which is Fastest? radius x 2 x 3.14**

circumference or orbiting distance around the Sun number of days or orbital period distance planet travels per day (Earth day!) 24 speed of planet in km/h (Earth hour!) Which is Fastest?

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Answers (Distances in Km)

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