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wavelength × 23observational-astronomy × 4
redshift × 4
spectra × 4
telescope × 3
radio-astronomy × 3
light × 2
space × 2
spectroscopy × 2
velocity × 2
star × 1
black-hole × 1
planet × 1
solar-system × 1
astrophysics × 1
cosmology × 1
atmosphere × 1
big-bang-theory × 1
expansion × 1
gravitational-waves × 1
cosmological-inflation × 1
luminosity × 1
space-telescope × 1
radiation × 1
interstellar-medium × 1
