Assertion: astronomer's observation | /r/HasProperty | performed in visual spectrum
Facets:
value: with optical telescopes
type: OTHER
value: for much
type: TEMPORAL
Source sentences:
text: For much of the history of observational astronomy, almost all observation was performed in the visual spectrum with optical telescopes.
text: For much of the history of observational astronomy, almost all observation was performed in the visual spectrum with optical telescopes.