A hundred thousand million Stars make one Galaxy; A hundred thousand million Galaxies make one Universe. The figures may not be very trustworthy, but I think they give a correct impression.

In any attempt to bridge the domains of experience belonging to the spiritual and physical sides of nature, time occupies the key position.

I ask you to look both ways. For the road to a knowledge of the stars leads through the atom; and important knowledge of the atom has been reached through the stars.

It is also a good rule not to put overmuch confidence in the observational results that are put forward until they are confirmed by theory.

Oh leave the Wise our measures to collate. One thing at least is certain, light has weight. One thing is certain and the rest debate. Light rays, when near the Sun, do not go straight.

Events do not happen; they are just there, and we come across them.

You cannot disturb the tiniest petal of a flower without the troubling of a distant star.