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How was it possible for scientists to discover the elements helium on the sun before it was discovered on earth

How was it possible for scientists to discover the elements helium on the sun before it was discovered on earth
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how was it possible for scientists to discover the elements helium on the sun before it was discovered on earth

User Wilderness
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Emission Spectra, using a spectrometer. This showed colored gas that seemed to be unearthly. Scientists later discovered this was Helium.
User TheKRAY
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Scientists used the emission spectra from the Sun to identify the elements of Hydrogen and Helium.
User Kharel
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