About: x-ray observatory

Premodifier: x-ray
Head noun: observatory

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

Broader concepts

label	provenance	confidence

Narrower concepts

label	provenance	confidence
roentgen satellite	isap:1449439	0.582711
chandra	isap:64970226	0.438195
rosat	isap:207775027	0.387316
xmm-newton	isap:315129307	0.216615