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- spectroscopy[remove]23
- galaxies7
- redshift-surveys6
- surveys6
- active-galactic-nuclei3
- ob-stars3
- stars3
- astronomical-simulations2
- objective prism2
- post-asymptotic-giant-branch-stars2
- stellar-atmospheres2
- disk-galaxies1
- globular-star-clusters1
- interstellar-medium1
- magellanic-clouds1
- milky-way-galaxy1
- observational-cosmology1
- quasars1
- strong-gravitational-lensing1
- x-ray-sources1