The velocities and forces involved in anything at orbital altitudes were enough to kill a human with just the rounding error. At their speeds, the friction from air too thin to breathe would set them on fire.
In the beginning, there was physics. “Physics” describes how matter, energy, space, and time behave and interact with one another. The interplay of these characters in our cosmic drama underlies all biological and chemical phenomena. Hence everything fundamental and familiar to us earthlings begins with, and rests upon, the laws of physics. When we apply these laws to astronomical settings, we deal with physics writ large, which we call astrophysics.
Something deeply hidden had to be behind things.
The time is my vehicle & the light is my fuel.
There is a philosophy that says that if something is unobservable — unobservable in principle — it is not part of science. If there is no way to falsify or confirm a hypothesis, it belongs to the realm of metaphysical speculation, together with astrology and spiritualism. By that standard, most of the universe has no scientific reality — it’s just a figment of our imaginations.
Cecile was teaching in Berkeley and I was [at Livermore]. He probably had, could have had, some influence on Teller, [for] Teller was quite generous in allowing me one whole semester off to be at Berkeley to work on something and also a semester off at the Institute for Advanced Study. Then I won the Gravity Research Foundation first prize.
Arthur Compton became my graduate advisor. He was the ideal graduate advisor for me: he came into my research room only once during my graduate career and usually had no idea how I was spending my time.
It’s hard to build models of inflation that don’t lead to a multiverse. It’s not impossible, so I think there’s still certainly research that needs to be done. But most models of inflation do lead to a multiverse, and evidence for inflation will be pushing us in the direction of taking [the idea of a] multiverse seriously.
Mathematics began to seem too much like puzzle solving. Physics is puzzle solving, too, but of puzzles created by nature, not by the mind of man.
… for it is very probable, that the motion of gravity worketh weakly, both far from the earth, and also within the earth: the former because the appetite of union of dense bodies with the earth, in respect of the distance, is more dull: the latter, because the body hath in part attained its nature when it is some depth in the earth.
(Foreshadowing Isaac Newton’s Universal Law of Gravitation (1687))