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As a planet orbits a star, the star experiences a slight gravitational pull towards the planet, causing the star to wobble. This tell tale wobble is revealed by alternating red shifts and blue shifts in lost star's spectral emissions. This is called .

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As a planet orbits a star, the star experiences a slight gravitational pull towards the planet, causing the star to wobble. This tell tale wobble is revealed by alternating red shifts and blue shifts in lost star's spectral emissions. This is called .






 
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