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...]]s. They can be analysed using the tools of [[chemical analysis]], e.g. [[spectroscopy]] and [[chromatography]]. ...bjects - like stars and far galaxies - by analyzing their radiation (see [[spectroscopy]]).

...d to date by [[rotational spectroscopy|microwave spectroscopy]], [[cosmic microwave background radiation|blackbody radiation]] left over from the [[big bang]]

...ould go a long way toward explaining its structure and movement: they used spectroscopy to determine whether light from the galaxies' arms moved toward the red or In 1969, only four years the microwave background radiation was discovered, astronomers began wondering why the ba