In his astronomical observations, he used the newly-invented telescope to discover mountains on the surface of 
(he; used; the newly-invented telescope; to discover mountains on the surface of; L:In his astronomical observations) Context(he used,List([34, 41))):(he; used the newly-invented telescope to discover; mountains; L:on the surface of)
he used,List([34, 41))
he he
used used the newly-invented telescope to discover
the newly-invented telescope to discover mountains on the surface of L:In his astronomical observations
mountains L:on the surface of