The Unified Astronomy Thesaurus

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Xenobiology original
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Astrobiology original
star this property definition "the study of synthesizing and manipulating biological devices and systems" - Wikipedia
X-ray transient sources original
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X-ray sources original
Transient sources original
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X-ray bursters original
X-ray telescopes original
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Space telescopes original
X-ray surveys original
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Surveys original
X-ray stars original
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Emission line stars original
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Single X-ray stars original
X-ray sources original
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Astronomical radiation sources original
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X-ray point sources original
X-ray bursts original
X-ray transient sources original
Cool cores original
Diffuse x-ray background original
X-ray quasars original
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Quasars original
X-ray point sources original
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X-ray sources original
X-ray photometry original
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Waveband photometry original
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Hardness ratio original
X-ray observatories original
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Observatories original
X-ray novae original
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Novae original
X-ray identification original
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X-ray astronomy original
X-ray detectors original
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Astronomical detectors original
X-ray bursts original
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X-ray sources original
Burst astrophysics original
X-ray bursters original
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X-ray binary stars original
X-ray transient sources original
X-ray bright point original
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X-ray astronomy original
X-ray binary stars original
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Compact binary stars original
Semi-detached binary stars original
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X-ray bursters original
High mass X-ray binary stars original
Low-mass X-ray binary stars original
X-ray astronomy original
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Astronomical methods original
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X-ray bright point original
X-ray identification original
X-ray active galactic nuclei original
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Active galactic nuclei original
Wormholes original
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Gravitational singularities original
Wolf-Rayet stars original
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Early-type emission stars original
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WC stars original
WCN stars original
WN stars original
Wolf diagram original
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Astrometry original
Winter solstice original
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Solstice original
Wilson effect original
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Sunspots original
Wide-field telescopes original
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Telescopes original
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All-sky cameras original
Baker-Nunn cameras original