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"Astronomy Chapter 3"
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absolute magnitude
absorption (dark-line) spectrum
apparent magnitude
astrometric binary
astrometry
atom
binary star
binding energy
bohr atom model
brightness
collisional broadening
continuous spectrum
distance modulus
double star
eclipsing binary
emission (bright-line) spectrum
energy levels
excited state
ground state
inverse square law
luminosity
main sequence
optical double
parallax angle
parsec
proper motion
radial velocity
rotational broadening
space velocity
spectral class
spectral sequence
spectroscopic binary
spectroscopy
stellar parallax
visual binary
white dwarf
wien's radiation law
zeeman effect