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P16 Space (The Life History of a Star (Massive Star: Protostar --> Main…
P16 Space
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The Expanding Universe
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The further away a distant galaxy is from you, the greater its red-shift is
The faster a distant galaxy is moving away from you, the greater its red-shift is
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The red-shift of a distant galaxy is the shift to longer wavelengths of the light from the galaxy because it is moving away from you
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Planets, Satellites and Orbits
As a body in a circular orbit moves around the orbit the magnitude of its velocity does not change, but the direction of its velocity continuously changes and is at right angles to the direction of the force
To stay in orbit at a particular distance, a small body must move at a particular speed around a larger body
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