Premodifier: x-ray
Head noun: observatory

Same concepts
http://dbpedia.org/resource/X-ray_astronomy

Broader concepts

labelprovenanceconfidence

Narrower concepts

labelprovenanceconfidence
roentgen satelliteisap:14494390.582711
chandraisap:649702260.438195
rosatisap:2077750270.387316
xmm-newtonisap:3151293070.216615