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- cosmology[remove]15
- galaxies10
- observational astronomy10
- nebulae9
- planets9
- stars9
- galactic and extragalactic astronomy8
- solar system astronomy7
- stellar astronomy7
- high energy astrophysics2
- software-tutorials2
- virtual observatory2
- virtual-observatories2
- active galactic nuclei1
- astrophysical jets1
- extragalactic objects1
- extrasolar planets1
- gamma rays1
- interstellar medium1
- lyman alpha1