Measure what can be measured, and make measureable what cannot be measured.

The Milky Way is nothing else but a mass of innumerable stars planted together in clusters.

All truths are easy to understand once they are discovered; the point is to discover them.

I, Galileo, son of the late Vicenzo Galilei, swear that I never said that the prime numbers are useless. What I said was that you cannot count lunar craters by counting 2, 3, 5, 7.

When the moon is ninety degrees away from the sun it sees but half the earth illuminated (the western half). For the other (the eastern half) is enveloped in night. Hence the moon itself is illuminated less brightly from the earth, and as a result its secondary light appears fainter to us.

Holy Writ was intended to teach men how to go to Heaven not how the heavens go.

Who would dare assert that we know all there is to be known?