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Space, Our Solar System, When a star is stable the forces pushing outwards…
Space
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The Sun
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The planets that are further away from the sun, the longer the orbit
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Life Cycle of stars 
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Red shift
A red shift is light waves that are stretched out if a star or galaxy is moving away from an observer. The wavelength of the light increases. This is called a red shift because the light is shifted towards a longer wavelength red end of the visible spectrum
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