All the evidence, experimental and even a little theoretical, seems to indicate that it is the energy content which is involved in gravitation, and therefore, since matter and antimatter both represent positive energies, gravitation makes no distinction.

You can’t blame gravity for falling in love.

The observer, when he seems to himself to be observing a stone, is really, if physics is to be believed, observing the effects of the stone upon himself.

Man can be understood only by ascending from physics, chemistry, biology, and geology. In other words, he is first of all a cosmic problem.

Atoms are very special: they like certain particular partners, certain particular directions, and so on. It is the job of physics to analyze why each one wants what it wants.

My discovery that black holes emit radiation raised serious problems of consistency with the rest of physics. I have now resolved these problems, but the answer turned out to be not what I expected.

My father was a research scientist in tropical medicine, so I always assumed I would be a scientist, too. I felt that medicine was too vague and inexact, so I chose physics.

Love is a sacred reserve of energy; it is like the blood of spiritual evolution.

It always seems odd to me that the fundamental laws of physics, when discovered, can appear in so many different forms that are not apparently identical at first, but, with a little mathematical fiddling, you can show the relationship.

It was Einstein’s dream to discover the grand design of the universe, a single theory that explains everything. However, physicists in Einstein’s day hadn’t made enough progress in understanding the forces of nature for that to be a realistic goal.

It should be possible to explain the laws of physics to a barmaid.

Some scientists think it may be possible to capture a wormhole and enlarge it many trillions of times to make it big enough for a human or even a spaceship to enter.

Natural gas is hemispheric. I like to call it hemispheric in nature because it is a product that we can find in our neighborhoods.

First, I want to pay tribute to Diana myself. She was an exceptional and gifted human being. In good times and bad, she never lost her capacity to smile and laugh, nor to inspire others with her warmth and kindness. I admired and respected her – for her energy and commitment to others, and especially for her devotion to her two boys.

Someday, after mastering the winds, the waves, the tides and gravity, we shall harness for God the energies of love, and then, for a second time in the history of the world, man will have discovered fire.

Before I started school striking I had no energy, no friends and I didn’t speak to anyone. I just sat alone at home, with an eating disorder. All of that is gone now, since I have found a meaning, in a world that sometimes seems shallow and meaningless to so many people.

Science predicts that many different kinds of universe will be spontaneously created out of nothing. It is a matter of chance which we are in.

Among physicists, I’m respected I hope.

I have lived in countries that were coming out of conflict: Ireland, South Africa, the Czech republic. People there are overflowing with energy.

The fundamental concept in social science is Power, in the same sense in which Energy is the fundamental concept in physics.

To every action there is always opposed an equal reaction.

Time can behave like another direction in space under extreme conditions.

The first amazing fact about gravitation is that the ratio of inertial mass to gravitational mass is constant wherever we have checked it. The second amazing thing about gravitation is how weak it is.

I think equation guessing might be the best method to proceed to obtain the laws for the part of physics which is presently unknown. Yet, when I was much younger, I tried this equation guessing, and I have seen many students try this, but it is very easy to go off in wildly incorrect and impossible directions.

Our virtues and our failings are inseparable, like force and matter. When they separate, man is no more.

It is indeed a matter of great difficulty to discover, and effectually to distinguish, the true motions of particular bodies from the apparent because the parts of that immovable space, in which those motions are performed, do by no means come under the observation of our senses.

According to ‚M‘ theory, ours is not the only universe. Instead, ‚M‘ theory predicts that a great many universes were created out of nothing.

I think the discovery of supersymmetric partners for the known particles would revolutionize our understanding of the universe.

I have a particular relationship with Vinod Khosla because he’s got a lot of very interesting science-based energy startups.

My first popular book, ‚A Brief History of Time,‘ aroused a great deal of interest, but many found it difficult to understand.

The cyclic universe theory predicts no gravitational waves from the early universe.

There is neither spirit nor matter in the world. The stuff of the universe is spirit-matter. No other substance but this could have produced the human molecule.

I tell you the solemn truth, that the doctrine of the Trinity is not so difficult to accept for a working proposition as any one of the axioms of physics.

Even if the economy crashes, we will still burn oil.

I feel a distaste for hunting, first because of a kind of Buddhist respect for the unity and sacredness of all life, and also because the pursuit of a hare or chamois strikes me as a kind of ‚escape of energy,‘ that is, the expenditure of our effort in an illusory end, one devoid of profit.

I always knew that St. Jude was an amazing organization but meeting the kids and seeing how the hospital works first hand was truly beautiful. It doesn’t feel like a regular hospital all dreary and sad. It’s a colorful, beautiful, comfortable, fun place to live and the energy is wonderful.

If the rate of expansion one second after the Big Bang had been smaller by even one part in a hundred thousand million million, it would have recollapsed before it reached its present size. On the other hand, if it had been greater by a part in a million, the universe would have expanded too rapidly for stars and planets to form.

There is no physical law precluding particles from being organised in ways that perform even more advanced computations than the arrangements of particles in human brains.

When he speaks to you he speaks with an earnest vibe and an earnest energy.

There could be no fairer destiny for any physical theory than that it should point the way to a more comprehensive theory in which it lives on as a limiting case.

Everything starts somewhere, although many physicists disagree.

We should remember that there are nations which meet more than 30 to 60% of their power requirements through the nuclear power system.

It’s obviously tricky to convert cellulose to a useful biofuel. I think actually the most efficient way to use cellulose is to burn it in a co-generation power plant. That will yield the most energy and that is something you can do today.

From the point of view of basic physics, the most interesting phenomena are, of course, in the new places, the places where the rules do not work – not the places where they do work! That is the way in which we discover new rules.

Before 1915, space and time were thought of as a fixed arena in which events took place, but which was not affected by what happened in it. Space and time are now dynamic quantities… space and time not only affect but are also affected by everything that happens in the universe.

I always believe that there should come a time when your energy, speed, stamina should combine well with your brains.

Gravity may put the planets into motion, but without the divine Power, it could never put them into such a circulating motion as they have about the Sun; and therefore, for this as well as other reasons, I am compelled to ascribe the frame of this System to an intelligent Agent.

Competition gives me energy. It keeps me focused.

The main thing that’s missing in energy is an incentive to create things that are zero-CO2-emitting and that have the right scale and reliability characteristics.

I can’t say this enough – the food that you put into your bodies can actually help you get better grades. And it can also affect your performance in sports and other activities too. You see, when you give your body the best possible fuel, you have more energy, you’re stronger, you think more quickly.

Enthusiasm is the yeast that makes your hopes shine to the stars. Enthusiasm is the sparkle in your eyes, the swing in your gait. The grip of your hand, the irresistible surge of will and energy to execute your ideas.

I think we all change each other’s paths. I don’t know which law idea that is in physics, but I don’t think any of us can live without affecting one another.

Today we say that the law of relativity is supposed to be true at all energies, but someday somebody may come along and say how stupid we were.

In the past, there was active discrimination against women in science. That has now gone, and although there are residual effects, these are not enough to account for the small numbers of women, particularly in mathematics and physics.

If you are in a spaceship that is traveling at the speed of light, and you turn on the headlights, does anything happen?

Because atomic behavior is so unlike ordinary experience, it is very difficult to get used to, and it appears peculiar and mysterious to everyone – both to the novice and to the experienced physicist.

We get the exciting result that the total energy of the universe is zero. Why this should be so is one of the great mysteries – and therefore one of the important questions of physics. After all, what would be the use of studying physics if the mysteries were not the most important things to investigate?

There happen to be a lot of people around who spent an hour on the Internet and think they know a lot of physics, but it doesn’t work like that… There’s a reason there are graduate schools in these departments.

An object in motion tends to remain in motion along a straight line unless acted upon by an outside force.

Today, we’re very dependent on cheap energy. We just take it for granted – all the things you have in the house, the way industry works.

Most people don’t have time to master the very mathematical details of theoretical physics.