Galileo, having heard of the invention of the telescope, constructed one of his own and from 1609 was able to confirm the heliocentric system by observing the phases of the planet Venus.
(Galileo; was; able to confirm the heliocentric system by observing the phases of the planet Venus; T:from 1609) (Galileo; constructed; one of his own) Context(Galileo constructed,List([0, 68))):(Galileo; constructed one of his own having heard; of the invention of the telescope)
Galileo constructed,List([0, 68))
Galileo Galileo Galileo
was constructed constructed one of his own having heard
able to confirm the heliocentric system by observing the phases of the planet Venus T:from 1609
one of his own
of the invention of the telescope