Relating to the use of spectroscopy to analyze and study the light and properties of stars and galaxies.
From astro- (star), spectro- (spectrum), and -scopic (relating to observation). A compound of spectroscopic applied specifically to astronomy, developed as the field matured in the 19th-20th centuries.
Astrospectroscopic observations can reveal not just what stars are made of, but how fast they're moving toward or away from us, whether they have planets, and even detect black holes by their gravitational effects on nearby stars!
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