Related terms:
balmer
quasars
nebula
lines
photon
stellar
galaxy
galaxies
spectral
accretion
emission
visible
spectrum
luminosity
optical
active galaxy
objects
observed
physics
hydrogen
accretion disc
black hole
absorption
spectral lines
astronomers
transition
spectroscopy
supermassive black hole
Wikipedia sources:
Quasar
Active galactic nucleus
Wolf-Rayet star
Balmer series
Emission spectrum
Stellar classification
Context for words:
emission
lines
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