Quotes from Stephen Hawking

Fizica cuantic? ne spune c? oricât de am?nunÈ›ite ar fi observaÈ›iile noastre asupra prezentului, trecutul (neobservat), la fel ca viitorul, e nedefinit È™i exist? doar ca un spectru de posibilit??i. Conform fizicii cuantice, universul nu are doar un singur trecut sau o singur? istorie.

Nuestras mentes son libres de explorar todo el universo y de ir con valentía incluso hasta donde Star Trek teme pisar.

La física cuántica es un nuevo modelo de la realidad que nos proporciona una imagen del universo que en muchos conceptos fundamentales para nuestra comprensión intuitiva de la realidad carecen de significado.

If you look behind every exceptional person there is an exceptional teacher.

I would see the end of physics as we know it, but now I think the wonder of discovery will continue long after I am gone. We are close to some of these answers, but we are not there yet.

people don't seem too worried about a possible end twenty billion years in the future. You can do quite a lot of eating, drinking and being merry before that.

I have been enormously privileged, through my work, in being able to contribute to our understanding of the universe. But it would be an empty universe indeed if it were not for the people I love, and who love me. Without them, the wonder of it all would be lost on me.

Even worse, if determinism breaks down, we can't be sure of our past history either. The history books and our memories could just be illusions. It is the past that tells us who we are. Without it, we lose our identity.

If you feel you are trapped in a black hole, don't give up. There is a way out.

A living being like you or me usually has two elements: a set of instructions that tell the system how to keep going and how to reproduce itself, and a mechanism to carry out the instructions.

But we are, by nature, explorers. Motivated by curiosity. This is a uniquely human quality. It is this driven curiosity that sent explorers to prove the Earth is not flat and it is the same instinct that sends us to the stars at the speed of thought, urging us to go there in reality.

It is said that Galileo demonstrated that Aristotle's belief was false by dropping weights from the leaning tower of Pisa. The story is almost certainly untrue, but Galileo did do something equivalent: he rolled balls of different weights down a smooth slope.

A living being like you or me usually has two elements: a set of instructions that tell the system how to keep going and how to reproduce itself, and a mechanism to carry out the instructions. In biology, these two parts are called genes and metabolism.

and energy, it would have taken an infinite amount of energy to get it there. For this reason, any normal object is forever confined by relativity to move at speeds slower than the speed of light.

the universe is not infinite in space, but neither does space have any boundary.

A model is a good model if it: Is elegant Contains few arbitrary or adjustable elements Agrees with and explains all existing observations Makes detailed predictions about future observations that can disprove or falsify the model if they are not borne out. For

We must not fear change. We need to make it work to our advantage.

I regard it as almost inevitable that either a nuclear confrontation or environmental catastrophe will cripple the Earth at some point in the next 1,000 years

As far as we are concerned, events before the big bang can have no consequences, so they should not form part of a scientific model of the universe. We should therefore cut them out of the model and say that time had a beginning at the big bang.

Creo que estamos actuando con imprudente indiferencia hacia nuestro futuro en el planeta Tierra.

El calentamiento global es causado por todos nosotros: queremos coches, viajes y un mejor nivel de vida.

Evolution has ensured that our brains just aren't equipped to visualise 11 dimensions directly. However, from a purely mathematical point of view it's just as easy to think in 11 dimensions, as it is to think in three or four. Stephen Hawking

realismo dependiente del modelo», basada en la idea de que nuestros cerebros interpretan los datos de los órganos sensoriales elaborando un modelo del mundo.

Economics is also an effective theory, based on the notion of free will plus the assumption that people evaluate their possible alternative courses of action and choose the best. That effective theory is only moderately successful in predicting behavior because, as we all know, decisions are often not rational or are based on a defective analysis of the consequences of the choice. This is why the world is in such a mess.