Assertion: quasar | /r/SimilarTo | single points of light
Facets:
value: in early optical images
type: LOCATION
Source sentences:
text: In early optical images, quasars looked like single points of light (i.e., point sources), indistinguishable from stars, except for their peculiar spectra.
text: In early optical images, quasars looked like single points of light (i.e., point sources), indistinguishable from stars, except for their peculiar spectra.