Stephen Hawking Famous Quotes

Einstein never accepted that the universe was governed by chance; his feelings were summed up in his famous statement “God does not play dice.

Anyway. I’m not allowed to watch TV, although I am allowed to rent documentaries that are approved for me, and I can read anything I want. My favorite book is A Brief History of Time, even though I haven’t actually finished it, because the math is incredibly hard and Mom isn’t good at helping me. One of my favorite parts is the beginning of the first chapter, where Stephen Hawking tells about a famous scientist who was giving a lecture about how the earth orbits the sun, and the sun orbits the solar system, and whatever. Then a woman in the back of the room raised her hand and said, “What you have told us is rubbish. The world is really a flat plate supported on the back of a giant tortoise.” So the scientist asked her what the tortoise was standing on. And she said, “But it’s turtles all the way down!” I love that story, because it shows how ignorant people can be. And also because I love tortoises.

In the eighteenth century, philosophers considered the whole of human knowledge, including science, to be their field and discussed questions such as: Did the universe have a beginning? However, in the nineteenth and twentieth centuries, science became too technical and mathematical for the philosophers, or anyone else except a few specialists. Philosophers reduced the scope of their inquiries so much that Wittgenstein, the most famous philosopher of this century, said, "The sole remaining task for philosophy is the analysis of language." What a comedown from the great tradition of philosophy from Aristotle to Kant!

So, remember to look up at the stars and not down at your feet. Try to make sense of what you see and wonder about what makes the universe exist. Be curious. And however difficult may life seem, there is always something you can do and succeed at. It matters that you don’t just give up. Unleash your imagination. Shape the future.

famous equation, E = mc2. So, if there’s

This picture of a hot early stage of the universe was first put forward by the scientist George Gamow in a famous paper written in 1948 with a student of his, Ralph Alpher. Gamow had quite a sense of humor—he persuaded the nuclear scientist Hans Bethe to add his name to the paper to make the list of authors “Alpher, Bethe, Gamow,

Why does the universe go to all the bother of existing? Is the unified theory so compelling that it brings about its own existence? Or does it need a creator, and, if so, does he have any other effect on the universe? And who created him? Up to now, most scientists have been too occupied with the development of new theories that describe what the universe is to ask the question why. On the other hand, the people whose business it is to ask why, the philosophers, have not been able to keep up with the advance of scientific theories. In the eighteenth century, philosophers considered the whole of human knowledge, including science, to be their field and discussed questions such as: Did the universe have a beginning? However, in the nineteenth and twentieth centuries, science became too technical and mathematical for the philosophers, or anyone else except a few specialists. Philosophers reduced the scope of their inquiries so much that Wittgenstein, the most famous philosopher of this century, said, 'The sole remaining task for philosophy is the analysis of language.' What a comedown from the great tradition of philosophy from Aristotle to Kant! However, if we do discover a complete theory, it should in time be understandable in broad principle by everyone, not just a few scientists. Then we shall all, philosophers, scientists, and just ordinary people, be able to take part in the discussion of the question of why it is that we and the universe exist. If we find the answer to that, it would be the ultimate triumph of human reason--for then we would know the mind of God.

when another German scientist, Werner Heisenberg, formulated his famous uncertainty principle. In order to predict the future position and velocity of a particle, one has to be able to measure its present position and velocity accurately. The obvious way to do this is to shine light on the particle. Some of the waves of light will be scattered by the particle and this will indicate its position. However, one will not be able to determine the position of the particle more accurately than the distance between the wave crests of light, so one needs to use light of a short wavelength in order to measure the position of the particle precisely. Now, by Planck’s quantum hypothesis, one cannot use an arbitrarily small amount of light; one has to use at least one quantum. This quantum will disturb the particle and change its velocity in a way that cannot be predicted. Moreover, the more accurately one measures the position, the shorter the wavelength of the light that one needs and hence the higher the energy of a single quantum. So the velocity of the particle will be disturbed by a larger amount. In other words, the more accurately you try to measure the position of the particle, the less accurately you can measure its speed, and vice versa.

What this all goes to show is that nonsense remains nonsense, even when talked by world-famous scientists. What serves to obscure the illogicality of such statements is the fact that they are made by scientists; and the general public, not surprisingly, assumes that they are statements of science and takes them on authority. That is why it is important to point out that they are not statements of science, and any statement, whether made by a scientist or not, should be open to logical analysis. Immense prestige and authority does not compensate for faulty logic.

in a famous paper in 1905, a hitherto unknown clerk in the Swiss patent office, Albert Einstein, pointed out that the whole idea of an ether was unnecessary, providing one was willing to abandon the idea of absolute time.

Einstein was awarded the Nobel prize for his contribution to quantum theory. Nevertheless, Einstein never accepted that the universe was governed by chance; his feelings were summed up in his famous statement, ‘God does not play dice.

Einstein never accepted that the universe was governed by chance; his feelings were summed up in his famous statement, ‘God does not play dice.’ Most other scientists, however, were willing to accept quantum mechanics because it agreed perfectly with experiment.

... picture of a hot early stage of the universe was first put forward by the scientist George Gamow in a famous paper written in 1948 with a student of his, Ralph Alpher. Gamow had quite a sense of humour - he persuaded the nuclear scientist Hans Bethe to add his name to the paper to make the list of authors 'Alpher, Bethe, Gamow'...

famous example is the so-called two-slit experiment (Fig. 4.2). Consider a partition with two narrow parallel slits in it. On one side of the partition one places a source of light of a particular color (that is, of a particular wavelength). Most of the light will hit the partition, but a small amount will go through the slits. Now suppose one places a screen on the far side of the partition from the light. Any point on the screen will receive waves from the two slits. However, in general, the distance the light has to travel from the source to the screen via the two slits will be different. This will mean that the waves from the slits will not be in phase with each other when they arrive at the screen: in some places the waves will cancel each other out, and in others they will reinforce each other. The result is a characteristic pattern of light and dark fringes. The remarkable thing is that one gets exactly the same kind of fringes if one replaces the source of light by a source of particles such as electrons with a definite speed (this means that the corresponding waves have a definite length). It seems the more peculiar because if one only has one slit, one does not get any fringes, just a uniform distribution of electrons across the screen. One might therefore think that opening another slit would just increase the number of electrons hitting each point of the screen, but, because of interference, it actually decreases it in some places. If electrons are sent through the slits one at a time, one would expect each to pass through one slit or the other, and so behave just as if the slit it passed through were the only one there – giving a uniform distribution on the screen. In reality, however, even when the electrons are sent one at a time, the fringes still appear. Each electron, therefore, must be passing through both slits at the same time!

Despite the complexity and variety of the universe, it turns out that to make one you need just three ingredients. Let’s imagine that we could list them in some kind of cosmic cookbook. So what are the three ingredients we need to cook up a universe? The first is matter—stuff that has mass. Matter is all around us, in the ground beneath our feet and out in space. Dust, rock, ice, liquids. Vast clouds of gas, massive spirals of stars, each containing billions of suns, stretching away for incredible distances. The second thing you need is energy. Even if you’ve never thought about it, we all know what energy is. Something we encounter every day. Look up at the Sun and you can feel it on your face: energy produced by a star ninety-three million miles away. Energy permeates the universe, driving the processes that keep it a dynamic, endlessly changing place. So we have matter and we have energy. The third thing we need to build a universe is space. Lots of space. You can call the universe many things—awesome, beautiful, violent—but one thing you can’t call it is cramped. Wherever we look we see space, more space and even more space. Stretching in all directions. It’s enough to make your head spin. So where could all this matter, energy and space come from? We had no idea until the twentieth century. The answer came from the insights of one man, probably the most remarkable scientist who has ever lived. His name was Albert Einstein. Sadly I never got to meet him, since I was only thirteen when he died. Einstein realised something quite extraordinary: that two of the main ingredients needed to make a universe—mass and energy—are basically the same thing, two sides of the same coin if you like. His famous equation E = mc2 simply means that mass can be thought of as a kind of energy, and vice versa. So instead of three ingredients, we can now say that the universe has just two: energy and space. So where did all this energy and space come from? The answer was found after decades of work by scientists: space and energy were spontaneously invented in an event we now call the Big Bang.

Even if there is only one possible unified theory, it is just a set of rules and equations. What is it that breathes fire into the equations and makes a universe for them to describe? The usual approach of science of constructing a mathematical model cannot answer the questions of why there should be a universe for the model to describe. Why does the universe go to all the bother of existing? Is the unified theory so compelling that it brings about its own existence? Or does it need a creator, and, if so, does he have any other effect on the universe? And who created him? Up to now, most scientists have been too occupied with the development of new theories that describe what the universe is to ask the question why. On the other hand, the people whose business it is to ask why, the philosophers, have not been able to keep up with the advance of scientific theories. In the eighteenth century, philosophers considered the whole of human knowledge, including science, to be their field and discussed questions such as: did the universe have a beginning? However, in the nineteenth and twentieth centuries, science became too technical and mathematical for the philosophers, or anyone else except a few specialists. Philosophers reduced the scope of their inquiries so much that Wittgenstein, the most famous philosopher of this century, said, “The sole remaining task for philosophy is the analysis of language.” What a comedown from the great tradition of philosophy from Aristotle to Kant! However, if we do discover a complete theory, it should in time be understandable in broad principle by everyone, not just a few scientists. Then we shall all, philosophers, scientists, and just ordinary people, be able to take part in the discussion of the question of why it is that we and the universe exist. If we find the answer to that, it would be the ultimate triumph of human reason – for then we would know the mind of God.

It is no good getting furious if you get stuck. What I do is keep thinking about the problem but work on something else. Sometimes it is years before I see the way forward. In the case of information loss and black holes, it was 29 years.” The

…nonsense remains nonsense, even when talked by world-famous scientists.

The fraction of the mass of two hydrogen atoms that is released as energy when they fuse to produce helium is 0.007 (0.7%). That is the source of the heat produced in the sun and in a hydrogen bomb. It is the amount of mass (m) that is converted to energy (E) in the famous Einstein formula E = mc2, and it is a direct measure of the strong nuclear force. If the strong force had a value of 0.006 or less, the universe would consist only of hydrogen—not very conducive to the complexities of life. If the value were greater than 0.008, all the hydrogen would have been fused shortly after the big bang, and there could be no stars, no solar heat—again, no life. As Stephen Hawking and Leonard Mlodinow put it in their book The Grand Design, “Our universe and its laws appear to have a design that both is tailor-made to support us and, if we are to exist, leaves little room for alteration.

The fraction of the mass of two hydrogen atoms that is released as energy when they fuse to produce helium is 0.007 (0.7%). That is the source of the heat produced in the sun and in a hydrogen bomb. It is the amount of mass (m) that is converted to energy (E) in the famous Einstein formula E = mc2, and it is a direct measure of the strong nuclear force. If the strong force had a value of 0.006 or less, the universe would consist only of hydrogen—not very conducive to the complexities of life. If the value were greater than 0.008, all the hydrogen would have been fused shortly after the big bang, and there could be no stars, no solar heat—again, no life. As Stephen Hawking and Leonard Mlodinow put it in their book The Grand Design, “Our universe and its laws appear to have a design that both is tailor-made to support us and, if we are to exist, leaves little room for alteration.

The fraction of the mass of two hydrogen atoms that is released as energy when they fuse to produce helium is 0.007 (0.7%). That is the source of the heat produced in the sun and in a hydrogen bomb. It is the amount of mass (m) that is converted to energy (E) in the famous Einstein formula E = mc2, and it is a direct measure of the strong nuclear force. If the strong force had a value of 0.006 or less, the universe would consist only of hydrogen—not very conducive to the complexities of life. If the value were greater than 0.008, all the hydrogen would have been fused shortly after the big bang, and there could be no stars, no solar heat—again, no life. As Stephen Hawking and Leonard Mlodinow put it in their book The Grand Design, “Our universe and its laws appear to have a design that both is tailor-made to support us and, if we are to exist, leaves little room for alteration.