Gravitation Quotes - page 4
The first step is that we need to revisit the validity of Newton's universal law of gravitation. Starting in the 1980s, Mordehai Milgrom at the Weizmann Institute in Israel showed that a small generalisation of Newton's laws can yield the observed dynamics of matter in galaxies and in galaxy clusters without dark matter. This approach is broadly known as MOND (MOdified Newtonian Dynamics). Milgrom's correction allows gravitational attraction to fall off with distance more slowly than expected (rather than falling off with the square of distance as per Newton) when the local gravitational acceleration falls below an extremely low threshold. This threshold could be linked to other cosmological properties such as the ‘dark energy' that accounts for the accelerating expansion of the Universe. These links suggest a deeper fundamental theory of space, time and matter, which has not yet been formulated.
Pavel Kroupa
The minimum principle that unified the knowledge of light, gravitation, and electricity of Hamilton's time no longer suffices to relate these fundamental branches of physics. Within fifty years of its creation, the belief that Hamilton's principle would outlive all other physical laws of physics was shattered. Minimum principles have since been created for separate branches of physics... but these are not only restricted... but seem to be contrived...
A single minimum principle, a universal law governing all processes in nature, is still the direction in which the search for simplicity is headed, with the price of simplicity now raised from a mastery of differential equations to a mastery of the calculus of variations.
William Rowan Hamilton
We can see that, the constant in the law of gravitation being fixed, there may be some upper limit to the amount of matter possible; as more and more matter is added in the distant parts, space curves round and ultimately closes; the process of adding more matter must stop, because there is no more space, and we can only return to the region already dealt with. But there seems nothing to prevent a defect of matter, leaving space unclosed. Some mechanism seems to be needed, whereby either gravitation creates matter, or all the matter in the universe conspires to define a law of gravitation.
Arthur Eddington
Democracy is not a tearing down; it is a building up. It is not denial of the divine right of kings; it supplements that same with the assertion of the divine right of all men. It does not destroy; it fulfills. It is the consummation of all theories of government, the spirit of which all the nations of the earth must yield. It is the great constructive course of the ages. It is the alpha and omega of man's relation to man, the beginning and the end. There is, and can be, no more doubt of the triumphs of democracy in human affairs than there is of the triumph of gravitation in the physical world. The only question is how and when. Its foundation lays hold upon eternity. It is unconcerned with the idolatry, or despotism, or treason, or rebellion, or betrayal, but bows in reverence before Moses, or Hamden, or Washington, or Lincoln, or the lights that shone on Calvary.
Calvin Coolidge
In any case God's act was the union of Mind with Matter by the same act or will which created both. No intermediate cause or condition intervened; no secondary influence had anything whatever to do with the result. Time had nothing to do with it. Every individual that has existed or shall exist was created by the same instantaneous act, for all time. "When the question regards the universal agent who produces beings and time, we cannot consider him as acting now and before, according to the succession of time." God emanated time, force, matter, mind, as he might emanate gravitation, not as a part of his substance but as an energy of his will, and maintains them in their activity by the same act, not by a new one. Every individual is a part of the direct act, not a secondary outcome.
Henry Adams
Inasmuch as the soul is present, there will be power not confident but agent. To talk of reliance is a poor external way of speaking. Speak rather of that which relies, because it works and is. Who has more obedience than I masters me, though he should not raise his finger. Round him I must revolve by the gravitation of spirits. We fancy it rhetoric, when we speak of eminent virtue. We do not yet see that virtue is Height, and that a man or a company of men, plastic and permeable to principles, by the law of nature must overpower and ride all cities, nations, kings, rich men, poets, who are not.
This is the ultimate fact which we so quickly reach on this, as on every topic, the resolution of all into the ever-blessed ONE. Self-existence is the attribute of the Supreme Cause, and it constitutes the measure of good by the degree in which it enters into all lower forms. All things real are so by so much virtue as they contain.
Ralph Waldo Emerson
It is inconceivable that inanimate brute matter should, without the mediation of something else which is not material, operate upon and affect other matter without mutual contact, as it must be, if gravitation in the sense of Epicurus, be essential and inherent in it. And this is one reason why I desired you would not ascribe innate gravity to me. That gravity should be innate, inherent, and essential to matter, so that one body may act upon another at a distance through a vacuum, without the mediation of anything else, by and through which their action and force may be conveyed from one to another, is to me so great an absurdity that I believe no man who has in philosophical matters a competent faculty of thinking can ever fall into it. Gravity must be caused by an agent acting constantly according to certain laws; but whether this agent be material or immaterial, I have left open to the consideration of my readers.
Isaac Newton