Whence do you have it that the terrestrial globe is so heavy? For my part, either I do not know what heaviness is, or the terrestrial globe is neither heavy nor light, as likewise all other globes of the universe. Heaviness to me (and I believe to Nature) is that innate tendency by which a body resists being moved from its natural place and by which, when forcibly removed therefrom, it spontaneously returns there. Thus a bucketful of water raised on high and set free, returns to the sea; but who will say that the same water remains heavy in the sea, when being set free there, does not move?

A Selection from Italian Prose Writers: with a double translation: for the use of students of the Italian language on the Hamiltonian system. London, Hunt and …

I tell you that if natural bodies have it from Nature to be moved by any movement, this can only be circular motion, nor is it possible that Nature has given t…

Note: Galileo's 'intimate friend and disciple, the well known Father Renieri' was chair of the mathematics department at the University of Pisa from 1640 to 16…

I tell you that if natural bodies have it from Nature to be moved by any movement, this can only be circular motion, nor is it possible that Nature has given t…

This entire globe, this star, not being subject to death, and dissolution and annihilation being impossible anywhere in Nature, from time to time renews itself…

I do not define time, space, place, and motion, as being well known to all. Only I must observe, that the common people conceive those quantities under no othe…