Unified Astronomy Thesaurus
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X-ray astronomy
X-ray binaries
USE
X-ray binary stars
X-ray binary stars
X-ray bright point
X-ray bursters
X-ray bursts
X-ray flares
X-ray galaxies
USE
X-ray astronomy
X-ray identification
X-ray novae
X-ray observatories
X-ray pulsars
X-ray quasars
X-ray sources
X-ray stars
X-ray surveys
X-ray telescopes
Xena
USE
Eris
Xenobiology