{
    "Astronomy": [
        "Abundances",
        "Ages",
        "AGN",
        "Associations",
        "Asteroseismology",
        "Atomic_Data",
        "Binaries:cataclysmic",
        "Binaries:eclipsing",
        "Binaries:spectroscopic",
        "Black_Holes",
        "BL_Lac_objects",
        "Blue_objects",
        "Clusters_of_galaxies",
        "Constellations",
        "Diameters",
        "Earth",
        "Ephemerides",
        "Equivalent_widths",
        "Exoplanets",
        "Extinction",
        "Galaxies",
        "Galaxies:Markarian",
        "Galaxies:spectra",
        "Globular_Clusters",
        "Gravitational_lensing",
        "Gravitational_wave",
        "GRB",
        "HII_regions",
        "Intergalactic_medium",
        "Interstellar_Medium",
        "Magnetic_fields",
        "Masers",
        "Masses",
        "_META_",
        "Models",
        "Molecular_Data",
        "Multiple_Stars",
        "Nebulae",
        "Neutrino",
        "Nonstellar",
        "Novae",
        "Obs_Log",
        "Open_Clusters",
        "Orbits",
        "Parallaxes",
        "Photometry",
        "Photometry:intermediate-band",
        "Photometry:narrow-band",
        "Photometry:surface",
        "Photometry:wide-band",
        "Planetary_Nebulae",
        "Planets+Asteroids",
        "Polarization",
        "Positional_Data",
        "Proper_Motions",
        "Pulsars",
        "QSOs",
        "Redshifts",
        "Rotational_Velocities",
        "Seyfert_Galaxies",
        "Spectral_Classification",
        "Spectrophotometry",
        "Spectroscopy",
        "Star_Forming_Region",
        "Stars",
        "Stars:brown_dwarf",
        "Stars:early-type",
        "Stars:Emission",
        "Stars:late-type",
        "Stars:peculiar",
        "Stars:variable",
        "Stars:white_dwarf",
        "Stars:WR",
        "Sun",
        "SuperNovae",
        "SuperNovae_Remnants",
        "Transient",
        "Velocities",
        "YSOs"
    ],
    "Mission": [
        "AKARI",
        "ANS",
        "ASCA",
        "BeppoSAX",
        "Cassini-Huygens",
        "CGRO",
        "Chandra",
        "COBE",
        "Copernicus",
        "CoRoT",
        "Einstein",
        "ESO",
        "EUVE",
        "EXOSAT",
        "FAUST",
        "Fermi",
        "FUSE",
        "Gaia",
        "GALEX",
        "GINGA",
        "GRANAT",
        "HaloSat",
        "HEAO",
        "Herschel",
        "Hipparcos",
        "HST",
        "HUT",
        "INTEGRAL",
        "IRAS",
        "ISO",
        "IUE",
        "Kepler",
        "LOFAR",
        "MSX",
        "NuSTAR",
        "OAO-2",
        "ORFEUS",
        "Planck",
        "ROSAT",
        "RXTE",
        "SAS-1",
        "SAS-2",
        "SMM",
        "SOHO",
        "Spitzer",
        "STEREO",
        "Suzaku",
        "Swift",
        "TD1",
        "TESS",
        "UIT",
        "ULYSSES",
        "WISE",
        "WMAP",
        "WUPPE",
        "XMM"
    ],
    "Wavelength": [
        "Radio",
        "Millimeter",
        "IR",
        "optical",
        "UV",
        "EUV",
        "X-ray",
        "Gamma-ray"
    ]
}