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- spectroscopy[remove]25
- galaxies7
- surveys7
- redshift-surveys6
- stars4
- active-galactic-nuclei3
- ob-stars3
- objective prism2
- stellar-atmospheres2
- astronomical-simulations1
- disk-galaxies1
- gamma-ray-astronomy1
- gamma-ray-sources1
- globular-star-clusters1
- interstellar-medium1
- magellanic-clouds1
- milky-way-galaxy1
- observational-cosmology1
- post-asymptotic-giant-branch-stars1
- quasars1