Assertion: quasar | /r/Synonym | radio stars
Facets:
value: in the early 1960
type: TEMPORAL
Source sentences:
text: Quasars were called "radio stars" in the early 1960's when they were first detected, because they emit large amounts of radiation, including radio waves.
text: In the early 1960's, quasars were referred to as radio stars because they were discovered to be a strong source of radio waves.