Galileo Galilei

Simplicio represents the Aristotelian view.

Sagredo is the curious layman.

Salviati speaks for Galileo.

The Earth moves around the Sun.

Stars are much farther than planets.

The surface of the Moon is rough.

Venus has phases like the Moon.

I thank you for your kindness.

My dear Kepler, what do you say to the leading philosophers of the faculty here, to whom I have offered a thousand times of mine own to show my studies, but who, with the lazy obstinacy of a serpent who has eaten his fill, have never consented to look at planets, nor moon, nor telescope?

Oh, my dear Kepler, how I wish we could have one good laugh together.

Philosophy is written in that great book which ever lies before our eyes — I mean the universe.

Taste is the literary sense of the tongue.

Without mathematics, one cannot penetrate the noble and profound science of nature.

The human mind is a noble instrument.

Observation and experiment are the only keys to the truth.

The universe is full of surprises.

Truth does not yield to authority.

Reason must prevail over tradition.

The eyes of the telescope reveal new worlds.

Galileo, the father of modern physics.