I was watching The Universe on H2 the other day and they were talking about a nebula that was made up of some type of alcohol. How do they know?
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The spectrograph of the light is examined to determine the composition of elements.
mmalky
mmalky
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How about you take the literal meaning of what I wrote to encourage your interest rather than being rude?
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by the spectrum of light they see from it. don't be afraid to by a "modern physics" textbook.