On the 100th anniversary of Albert Einstein's general theory of relativity, Bennett's book seeks to explain both special and general relativity in a form that a nonexpert could understand. [Book Excerpt: "What is Relativity"] "There are a lot of good books about relativity, but most have...
7、 do in writing a scientific paper?A In order to emphasize our views, we should put our strong emotions into the text.B Slightly present our political comments is allowed.C We should follow the mainstream ideas of general public.D We should present facts, theories, proofs, experiments, te...
In fact, the range spans more than a billion years! The discovery that the universe is expanding led to another question. Will it expand forever? Will it stop? Will it reverse? According to the general theory of relativity, it all depends on how much matter is within the universe. It ...
General relativity tells us that gravity is not a force, but a curvature of spacetime.(Image credit: NASA.) Albert Einstein was famous for many things, but his greatest brainchild is the theory of relativity. It forever changed our understanding of space and time. What is relativity? Succinctl...
What is chemistry in simple words? Chemistry is the study of the substances that make up our world (matter and energy). This includes everything from the shape of the water molecules that we drink to the manufacturing of chemical fertilizers that help us grow food.What...
What we do know is that if we look at a typical galaxy, take account of all the matter that we see (stars, gas, dust) and use Newton's Laws of Gravity and motion (or, more correctly, Einstein's General Relativity), to try to describe the motions of that material, then we get th...
State the postulates of special relativity. Is it possible to have faster than light movement in General Relativity? Is Einstein's theory of relativity (E=MC 2 ) correct? When does sound travel the fastest night or day time? Explain. ...
It occurs at many levels of animal life, though we cannot be sure of its presence in the simpler organisms, and it is very difficult to say in general what provides evidence of it. (Some extremists have been prepared to deny it even of mammals other than man.) No doubt it occurs in...
It was part of his famous General Theory of Relativity, and it offered a very different explanation from Newton's Law of Universal Gravitation. Einstein didn't believe gravity was a force at all; he said it was a distortion in the shape of space-time, otherwise known as "the fourth ...
This was the observational motivation that led to Einstein's Theory of General Relativity (GR), which he published in 1915. GR has a completely different take on the nature of gravity. Indeed, it has a completely different take on the nature of space and time. Or at least that is the ...