Quotes About Gravity

Three of the four forces (excluding gravity) are therefore united by quantum theory, giving us unification without geometry, which appears to contradict the theme of this book and everything we have considered so far.

Even with a rigorous exercise program, after a year on the space station, the bones and muscles of Russian cosmonauts are so atrophied that they can barely crawl like babies when they first return to Earth.

Kip Thorne says, "By 2020, physicists will understand the laws of quantum gravity, which will be found to be a variant of string theory.

Second is N, equal to 1036, which is the strength of the electric force divided by the strength of gravity, which shows how weak gravity is.

Cuando estamos sentados en una silla, creemos que la tocamos, pero en realidad estamos suspendidos sobre ella, flotando a menos de un nanometro sobre el asiento

Normally communication between these universes is impossible. The atoms of our body are like flies trapped on flypaper. We can move freely about in three dimensions along our membrane universe, but we cannot leap off the universe into hyperspace, because we are glued onto our universe. But gravity, being the warping of space-time, can freely float into the space between universes.

Finalmente, Einstein creó dos grandes teorías. La primera fue la relatividad especial, que describía las propiedades de los rayos de luz en el espacio-tiempo e introducía una simetría basada en rotaciones en cuatro dimensiones. La segunda fue la relatividad general, en la que la gravedad se revela como la curvatura del espacio-tiempo.

why doesn't the universe spin?

possible for astronauts to lift impossibly heavy objects with ease.

starships of the future may have to spin, creating an artificial gravity via centrifugal forces in order to sustain human life.

La atracción gravitatoria es una ilusión. Por ejemplo, quizá ahora esté sentado en una silla, leyendo este libro. Por lo general, diría que la gravedad tira de usted hacia el asiento, y por eso no sale volando hacia el espacio. Pero Einstein diría que está sentado en la silla porque la Tierra deforma la masa de espacio sobre su cabeza, y esa deformación le empuja hacia el suelo.

Imaginemos también unas hormigas que se mueven sobre una hoja de papel arrugada. No pueden moverse en línea recta. Puede que sientan una fuerza que tira de ellas continuamente, pero nosotros, que miramos las hormigas desde arriba, vemos que no hay ninguna fuerza en absoluto. Esta es la idea que surge de lo que Einstein llamó «relatividad general»: el espacio-tiempo se deforma por masas pesadas, lo que provoca la ilusión de la fuerza gravitatoria.

Lunar tourism and exploration could become popular recreational activities as people discover the wonders of an alien landscape. Given the low gravity, hikers would be able to trek over long distances without tiring. Mountain climbers would be able to rappel down steep mountainsides with little effort.

If the moon comes any closer, it is literally torn apart by the gravity of Saturn. Using Newton's laws, astronomers can calculate the distance of the tipping point, which is called the Roche limit.

A figure skater, for example, can only spin about four times in the air on the Earth. No skater has ever performed a quintuple jump. This is because the height of the jump is determined by the velocity at takeoff and the strength of gravity.

If the universe is dense enough, then there is enough matter and gravity to attract the distant galaxies and reverse the expansion, so that the Big Crunch becomes a realistic possibility. If the universe lacks sufficient mass, then there is not enough gravity to reverse the expansion and the universe goes into a Big Freeze. The critical density separating these two scenarios is roughly six hydrogen atoms per cubic meter.

An interesting fact is that astronauts become several inches taller in outer space due to the expansion of their spinal columns. Once back on Earth, their height reverts back to normal. Astronauts may also lose 1 percent of their bone mass per month in space. To slow down this loss, they have to exercise at least two hours a day on a treadmill

So this is one goal of modern physics: to create a quantum theory of gravity where the quantum corrections are finite and calculable. In other words, Einstein's theory of gravity allows for the formation of wormholes, which may one day give us shortcuts through the galaxy. But Einstein's theory cannot tell us if these wormholes are stable or not. To calculate these quantum corrections, we need a theory that combines relativity with the quantum theory.

We all obey laws that exist within our personal reality. Asleep, we're still dreaming but the laws are different. If laws exist at all, the law of gravity may not exist in our sleeping dreams, the laws of physics are ignored and basic logic becomes irrelevant. Our waking dream follows physical laws and social and civic laws.

She gave a little jump and hung in the air a little way above the rug, then she slowly began to be drawn downwards and dropped ..

The heavier the burden, the closer our lives come to the earth, the more real and truthful they become.

the heavier the burden, the closer our lives come to the earth, the more real and truthful they become. the absolute of a burden causes man to be lighter than air.

Schwere, Notwendigkeit und Wert sind drei eng zusammenhängende Begriffe: nur das Notwendige ist schwer, nur was wiegt, hat Wert.

È stato allora che ho capito il significato magico del cerchio. Quando si è allontanati da una fila, è ancora possibile reinserirsi. La fila è una formazione aperta. Ma il cerchio si richiude e non ci si può tornare. Non per caso i pianeti si muovono in cerchio, e la pietra che se ne stacca si allontana inesorabilmente, spinta dalla forza centrifuga. Simile a un meteorite staccatosi da un pianeta, io sono precipitato dal cerchio e non ho finito, ancora oggi, di cadere.