Galileo , having heard of the invention of the telescope, constructed one of his own and, starting in 1609, was able to confirm the heliocentric system by observing the phases of the planet Venus.
(Galileo; constructed; one of his own) Context(Galileo constructed,List([0, 69))):(Galileo; constructed one of his own having heard; of the invention of the telescope) (Galileo; was; able to confirm the heliocentric system by observing the phases of the planet Venus)
Galileo constructed,List([0, 69))
Galileo Galileo Galileo
constructed constructed one of his own having heard was
one of his own
of the invention of the telescope
able to confirm the heliocentric system by observing the phases of the planet Venus