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What kinds of evidence supports the belief that molecules of various
kinds, including some complex ones, exist in space?

Please include references to support answer.

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Most of the evidence is spectroscopic in nature.

Each atom and each molecule have a certain spectroscopic signature that depends on the molecular (or atomic structure).

when a light wave hits an atom, some of the energy will be transfered to excite electrons (move them to a higher energy level). Quantum mechanics dictate that these transitions can happen from only certain energy levels to others. Thus only some of the wavelengths in the light will be used to excite electrone (absorbed), while the rest of the wavelengths will reflect of the atom. Therefore, an examination of the spectrum of the light (examining the wavelengths present in the light) revels the type of ...