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OpenStudy (anonymous):
A star has a spectrum shift exhibiting a blue shift. What can you conclude about the distance from Earth to that star?
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OpenStudy (jfraser):
a blue shift loosely indicates that the light from the star is reaching the earth sooner than it should, so the light waves are being compressed slightly. Imagine you had a long spring stretched between two points. |dw:1335483912393:dw| The only way to get the spring's "wavelength" to shrink is to do what???
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