Assertion: telescope | /r/HasProperty | important
Facets:
value: for astronomy
type: TRANSITIVE-OBJECT
value: in proving their existence
type: OTHER
Source sentences:
text: Telescopes are important in proving their existence, but the telescopes used are very different from Galileo's, and they carry their own burden of doubt, theory and proof.
text: A telescope is an important tool for astronomy that gathers light and directs it to a single point.