What conclusion was strongly supported by Galileo's observation that Venus exhibited a full cycle of phases, similar to the Moon?

Answer

That Venus orbited the Sun

Observing Venus go through a full cycle of phases provided powerful confirmation supporting the Copernican model, specifically that Venus orbits the Sun.

What conclusion was strongly supported by Galileo's observation that Venus exhibited a full cycle of phases, similar to the Moon?
Galileotelescopeinstrumentobservationsky