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We know that there are complex organic molecules in space. Just like individual atoms, molecules can emit light at very specific colors, and by finding those colors of emitted light we can detect the molecules. In general, the light is actually in the radio wavelength part of the spectrum, so giant radio telescopes are used to find them. The observations are a bit tricky, because molecules have lots of ways of emitting different kinds of light, so the total energy the molecule has to emit at
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