*A Brief History of Time*).

Albert Einstein first suggested the theory of relativity in 1905, which states every observer has their own unique measure of time, though the laws of science and the speed of light are the same for all observers. The later proposed special theory of relativity neglects gravitational effects. Einstein proposed the general theory of relativity in 1915, which is widely used today. It incorporates gravity, not as a force, but as a consequence of the fact space-time is not flat. Instead, it is curved by mass and energy, and objects take as straight a line as they can as they move through this warped space-time.

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*A Brief History of Time*LitChart as a printable PDF.## Theories of Relativity Term Timeline in *A Brief History of Time*

The timeline below shows where the term Theories of Relativity appears in

*A Brief History of Time*. The colored dots and icons indicate which themes are associated with that appearance.Chapter 1

**general theory of relativity**, matched with what was seen, a critical confirmation of his new theory. Newton’s theory is...

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**general theory of relativity**and quantum mechanics—both great achievements of the first half of the 20th century. The first...

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**relativity**and quantum mechanics, which eventually gave us nuclear power and microelectronics. Thus, the search for...

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Chapter 2

**theory of relativity**, which meant that the laws of science were the same for all freely moving observers....

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**relativity**and cannot reach light speed. Only light, or other things with no mass, i.e. waves,...

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**Relativity**has changed the way we see space and time forever. Under Newton's theory, observers would...

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**theory of relativity**, distance is determined by time and light speed, so every observer must agree on the...

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**the special theory of relativity**. All light cones would be identical and point in the same direction as light speed...

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**the special theory of relativity**'s idea that nothing moves at or above the speed of light.

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**general theory of relativity**. He suggested that gravity is not like other forces. Rather, it is the result of...

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**general relativity**, objects take a straight route in curved, four-dimensional space-time, but seem to take curved routes...

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**general relativity**. Light cones near the sun ought to bend slightly inward, because of the sun's mass....

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**general relativity**, time should also run more slowly when closer to objects with large mass, like the...

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**relativity**ended the idea of absolute time. If twins separated, with one living on top of...

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**general relativity**that thinking has changed considerably. Space and time are affected by objects' movement and forces,...

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**general theory of relativity**suggested there was indeed a beginning and end to the universe.

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Chapter 3

**general theory of relativity**. Instead he thought up a kind of anti-gravitational force he called the cosmological constant.

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**general theory of relativity**with quantum mechanics (as discussed later), space and time can be finite without a boundary....

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**general theory of relativity**.

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**general theory of relativity**is only a partial theory. It breaks down at the beginning of the universe. When...

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Chapter 4

**general theory of relativity**is considered a classical theory because it does not include quantum mechanics. This does not...

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Chapter 5

**general theory of relativity**and quantum mechanics. He showed mathematically how spin ½ works and predicted that electrons should...

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**general theory of relativity**and quantum mechanics must follow the symmetry of CPT. J. W. Cronin and Val Fitch...

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**general relativity**and quantum mechanics together.

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Chapter 6

**general relativity**at the time, Subrahmanyan Chandrasekhar worked out how big a star needed to be to...

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**general relativity**let the astronaut escape through a wormhole, to appear somewhere else in the universe. But...

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**General relativity**states that moving objects give off gravitational waves, which bend space-time. These waves carry energy...

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**general relativity**equations to describe them.

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Chapter 7

**general relativity**and quantum theory combining. John G. Taylor opposed Hawking when he announced these discoveries. But...

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Chapter 8

**general relativity**predicted that space-time began as a singularity in the big bang, and ends in the...

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**General relativity**alone cannot answer these questions. Its laws and all laws we have so far break...

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**General relativity**relies on singularities, which involve the break down of scientific law. Really, what singularity theories...

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**general relativity**is that gravity is represented in a curved space-time. Applying the sum over histories to...

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**quantum and general relativity theory**, if we know the make up of the universe at the beginning, we can...

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Chapter 9

**General relativity**cannot tell us what happened at the very beginning or what happens in singularities, because...

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Chapter 10

**general relativity**. He said the whole universe was rotating in the direction spinning tops point. As a...

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**general relativity**do allow for time travel, and fit what one can observe in the universe. For...

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Chapter 11

**general relativity**, incomplete gravity theories, and the three forces that can be combined in grand unified theories,...

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**general relativity**. This has already resulted in significant rethinks, such as black holes not being black and...

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**general relativity**one can either adjust the strength of gravity or the cosmological constant. But this still...

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**general relativity**’s predictions unchanged, except on the miniscule level. Their work didn’t gain much attention at first....

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**theory of general relativity**in his day. Today many thousands do. If we were to find the unifying theory...

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Chapter 12

**General relativity**states there must have been a point of infinite density at the beginning, the big...

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