Assertion: telescope's design | /r/HasProperty | segmented primary mirror
Facets:
value: with a diameter of 42 metres
type: OTHER
Source sentences:
text: Early designs included a segmented primary mirror with a diameter of 42 metres (140 feet) and an area of about 1,300 m2 (14,000 sq ft), with a secondary mirror with a diameter of 5.9 m (19 ft).