Astr 12160 midterm - Study guides, Class notes & Summaries

absolute magnitude - ️️The actual brightness of a star absorption line spectrum - ️️A cloud of gas between us and a light bulb can absorb light of specific wavelengths, leaving dark absorption lines in the spectrum apparent magnitude - ️️the brightness of a star as seen from Earth arcminute - ️️1/60 of a degree arcsecond - ️️1/3600 of a degree blue shift - ️️the displacement of the spectrum to shorter wavelengths in the light coming from distant celestial o...