Assertion: newtonian telescope's mirror | /r/HasProperty | heavy
Facets:
value: quite
type: DEGREE
Source sentences:
text: Often mirror cells have only three edge supports, and if the mirror is heavy enough, it can effectively become wedged between the two bottom supports when the telescope is pointed low, and this squeezes the mirror.
text: Because larger mirrors are heavy, it is difficult to build large equatorial mounts for reasonable costs, so alt-az mounts tend to be seen more for larger research grade scopes.
text: Primary mirrors are quite heavy and most telescope tubes are quite light.