21–40 of 84
He talked to us about the new theory of black holes which he had then just worked out. The idea of a black hole was one of the most dramatic consequences of Einstein's theory of gravity. According to Einstein's equations, a massive star at the end of its life, when it has exhausted its nuclear fuel, continues to…
Broadly speaking, to discover new regularities and laws we either follow top–down or the bottom–up approach (Fig. 1). In the top–down approach, the search begins with an external observation e.g., Newton’s laws of motion. The observer intuitively imagines a set of elements, a set of interactions and a mathematically…
"There are a million points of light in the universe traveling a million miles an hour away from us, yet they are so far away they appear to be standing still." "Estimate for # of planets in visible universe: 10^25, which = # molecules in a cup of water" Robert Garisto, PRL "I'm is Juliet Retenford and my favorite…
January 24, 1936 Dear Phyllis, I will attempt to reply to your question as simply as I can. Here is my answer: Scientists believe that every occurrence, including the affairs of human beings, is due to the laws of nature. Therefore a scientist cannot be inclined to believe that the course of events can be influenced…
The "overbeliefs" of an enlightened man rest on the firmest basis of reality available. This he finds in the scientific picture of the universe of his age. On this foundation of natural knowledge he erects a unique unproven structure of "overbeliefs" concerning his universe, origin, life, hereafter, religion and God…
So, if we continually exchange matter with the outside world, if our bodies are completely renewed every few years, and if each of us is a walking colony of trillions of largely symbiotic life-forms, exactly what is this self that we view as separate? You are not an isolated being. Metaphorically, to follow current…
The Mechanic's Wisdom. Probably the most characteristic attitude of the mechanic toward the forces and materials with which he deals is unquestioning acceptance of the fact that he cannot change or anywise modify the laws of nature or the qualities of materials. The mechanic, like the rest of us, wants to accomplish a…
Ordinary people can help create new money by making promises. You constrain the future by making a plan, and a promise to keep to it. Money is created in response, because in making that promise you have created value. New money is created to represent that value. This is why it is possible for banks to fall apart…
Rational mechanics soon became a vast and profound science. The true laws of the collision of bodies, respecting which Descartes was deceived, were at length known. Huyghens discovered the laws of circular motions; and at the same time he gives a method of determining the radius of curvature for every point of a given…
The march of the sciences is rapid and brilliant. The Algebraic language becomes generalized, simplified and perfected, or rather it is now only that it was truly formed. The first foundations of the general theory of equations are laid, the nature of the solutions which they give is ascertained, and those of the…
For much of the modern era, scientists followed Nicolaus Copernicus, Galileo Galilei, and Isaac Newton in believing the cosmos to be eternal and unchanging. But in 1917, when Albert Einstein applied his theory of relativity to space-time as a whole, his equations implied that the universe could not be static; it must…
'Well, then, supposing there were other suns in the universe.' He broke off a little bashfully. 'I mean suns that are so far away that they're too dim to see. It sounds as if I've been reading some of that fantastic fiction, I suppose.' 'Not necessarily. Still, isn't that possibility eliminated by the fact that…
Georges Lemaitre was a pudgy, pinkish Belgian Jesuit abbe—a Catholic priest—who also happened to be a skilled astronomer. Lemaitre had noticed that Einstein's general theory of relativity would have implied that the universe was expanding but for a troublesome little mathematical term called the cosmological constant…
America's embrace of Einstein stood in stark contrast to the treatment he was getting at home. Right-wing relativity deniers, like modern American climate science deniers, mounted ad hominem attacks against Einstein and his theory, which they loudly branded a "hoax." They were led by an engineer named Paul Weyland…
...the goal of planet colonization has been challenged by a radically different notion of the Final Frontier Created by Princeton professor of physics Gerard K.O'Neill, this new concept is based on one of those revolutionary propositions that are so simple they seem self-evident. The surface of a planet, O'Neill…
LAW I. Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed thereon. Projectiles persevere in their motions, so far as they are not retarded by the resistance of the air, or impelled downwards by the force of gravity. A top…
RULE I We are to admit no more causes of natural things, than such as are both true and sufficient to explain their appearances. To this purpose the philosophers say, that Nature does nothing in vain, and more is in vain, when less will serve; for Nature is pleased with simplicity, and affects not the pomp of…
For myself, I like a universe that, includes much that is unknown and, at the same time, much that is knowable. A universe in which everything is known would be static and dull, as boring as the heaven of some weak-minded theologians. A universe that is unknowable is no fit place for a thinking being. The ideal…
I like relativity and quantum theories because I don't understand them and they make me feel as if space shifted about like a swan that can't settle, refusing to sit still and be measured; and as if the atom were an impulsive thing always changing its mind.
Thus the system of the world only oscillates around a mean state from which it never departs except by a very small quantity. By virtue of its constitution and the law of gravity, it enjoys a stability that can be destroyed only by foreign causes, and we are certain that their action is undetectable from the time of…