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The phases of Venus, observed by Galileo in 1610

A replica of the earliest surviving telescope attributed to Galileo Galilei, on display at the Griffith Observatory.

Dome of the cathedral of Pisa with the "lamp of Galileo"

In 1616, on the orders of the then pope, Paul V, Cardinal Bellarmine summoned Galileo Galilei, notified him of a forthcoming decree of the Congregation of the Index condemning the Copernican doctrine of the mobility of the Earth and the immobility of the Sun, and ordered him to abandon it.[2] Galileo agreed. When Galileo later complained of rumors to the effect that he had been forced to abjure and do penance, Bellarmine wrote out a certificate denying the rumors, stating that Galileo had merely been notified of the decree and informed that, as a consequence of it, the Copernican doctrine could not be "defended or held".[3] (In 1633 Galileo would again be called before the Inquisition in this matter.)

heliocentrism is the theory that the Sun is at the center of the Universe.

Aristarchus's 3rd century BC calculations on the relative sizes of the Earth, Sun and Moon, from a 10th century AD Greek copy

In the 17th century AD Galileo Galilei opposed the Roman Catholic Church by his strong support for heliocentrism

Galileo and his family moved to Florence in 1572.

While in Padua he met Marina Gamba, and in 1600 their daughter Virginia was born.

He started to study for the priesthood, but left and enrolled for a medical degree at the University of Pisa