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active-galaxy × 45galaxy × 15
quasars × 8
radio-astronomy × 5
supermassive-black-hole × 5
observational-astronomy × 4
cosmology × 4
spectrometry × 4
spectra × 3
star-formation × 3
magnetic-field × 3
galaxy-center × 3
astrophysics × 2
milky-way × 2
data-analysis × 2
spectroscopy × 2
galactic-dynamics × 2
galaxy-cluster × 2
dust × 2
flux × 2
gamma-rays × 2
astronomical-jet × 2
star × 1
black-hole × 1
gravity × 1