"[Time is not] a mysterious illusion of the intellect. ..It is an essential feature of the universe."

"Perhaps the first to approach the fourth dimension from the side of physics, was the Frenchman, Nicole Oresme, of the…"

"Although the peculiarly fundamental nature of time in relation to ourselves is evident as soon as we reflect that our…"

"Our conscious appreciation of the fact that one event follows another is of a different kind from our awareness of ei…"

"Whether the stars were all at the same distance, or whether they were scattered throughout infinite space, or whether…"

"Although the classic theoretical foundation of distance measurement in physics is the 'rigid rod', nearly all distanc…"

"Space-time is curved in the neighborhood of material masses, but it is not clear whether the presence of matter cause…"

"Galileo had raised the concepts of space and time to the status of fundamental categories by directing attention to t…"

"Let us suppose that an explosion occurs on Mars, which is observed by an astronomer on earth, who records the instant…"

"Our idea of the universe as a whole remains a product of the imagination."