Assertion: quasar | /r/HasProperty | distributed around entire sky
Facets:
Source sentences:
text: The International Celestial Reference System (ICRS) is based on hundreds of extra-galactic radio sources, mostly quasars, distributed around the entire sky.
text: The International Celestial Reference System (IRCS) is based on hundreds of extra-galactic radio sources, mostly quasars, distributed around the entire sky.
text: The International Celestial Reference System (IRCS) is based on hundreds of extra-galactic radio sources, mostly quasars, distributed around the entire sky.