Presents Galileo's scientific treatise, originally published in 1632, in which he uses the dialogue form to argue the truth of the Copernican system over the Ptolemaic, proving that the Earth revolves around the sun.
Presents an unabridged reprint of the English translation of Galileo's astronomical and philosophical text in which he sets forth, in the form of dialogues, his theories about the motion of the Earth and planets.
