Space-time Term Analysis

...by multiplying half the distance of the round trip by the speed of light. A space-time diagram, can be used by different observers moving at different speeds, and no measurement is... (full context)

...accept that time is not independent of space, but rather combined in an idea called space-time. (full context)

...coordinates: three in space, and the fourth in time. These can all be arbitrary. In space-time, there is no distinction between space and time coordinates, like there's no difference between space... (full context)

...the surface of the earth, because any point can be determined by latitude and longitude. Space-time diagrams can show time increasing on one axis, and one dimension of space on the... (full context)

...that gravity is not like other forces. Rather, it is the result of the fact space-time is not flat. It is curved according to the mass and energy distributed across it.... (full context)

In general relativity, objects take a straight route in curved, four-dimensional space-time, but seem to take curved routes in three-dimensional space. For example, an airplane flying straight... (full context)

The sun's mass and resultant gravitational force curves space-time so that although the earth travels straight in four-dimensional space-time, it looks like it follows... (full context)

...thinking has changed considerably. Space and time are affected by objects' movement and forces, and space-time in turn affects the movement of those forces and objects. Just as space and time... (full context)

...in his day. Essentially, his work states that stars’ gravitational pull changes light’s path through space-time. Finally, the light is pulled so strongly, it cannot escape. As light moves faster than... (full context)

...showed in the late 1960s that there must be a singularity of infinite density and space-time curvature at the center of a black hole. This is similar to the beginning of... (full context)

General relativity states that moving objects give off gravitational waves, which bend space-time. These waves carry energy away from the object producing them. Slowly, these objects lose energy... (full context)

Einstein’s general relativity predicted that space-time began as a singularity in the big bang, and ends in the potential big crunch... (full context)

...today? We find the universe is ordered, so that order should also apply to the space-time boundary. (full context)

...imaginary numbers to represent time, which clears away any difference between space and time. Euclidean space-time (so-called after Euclid, the Ancient Greek who founded two-dimensional geometric studies) is four-dimensional, but really... (full context)

...theory of quantum mechanics and general relativity is that gravity is represented in a curved space-time. Applying the sum over histories to Einstein’s ideas on gravity, the history of a particle... (full context)

Each sum over histories history offers a comprehensive account of space-time and its contents. Again, the anthropic principle can explain why one history is right rather... (full context)

The idea that space-time has a closed surface with no boundary seems to eliminate the role of God. People... (full context)

Mathematician Kurt Gödel suggested a new model of space-time in 1949 under general relativity. He said the whole universe was rotating in the direction... (full context)

Other space-times allowed by the rules of general relativity do allow for time travel, and fit what... (full context)

In the Gödel solution and the cosmic string space-time, the universe was so distorted in the beginning that travel into the past was allowed.... (full context)

...speed of light, however, and rockets cannot get enough power to achieve this speed. Perhaps space-time could be warped to allow a shortcut, allowing a wormhole between two regions; this would... (full context)

...This is called the Casimir effect. Along with light bending during eclipses, these observations show space-time could be warped. (full context)

...past. One explanation is called the consistent histories approach, which says everything that happens in space-time must be consistent according to the laws of physics. This means you would only travel... (full context)

...contained, so the time traveler would have to travel back to his or her own space-time’s past. (full context)

...purposefully prevent large-scale time travel. But this has not been proven. The idea goes, when space-time is warped enough to allow time travel, virtual particles moving in closed loops become real... (full context)

...technically infinite numbers of particles, which add infinite mass to the universe, and so curve space-time into an infinitely small size. (full context)

...in one place at one time, and their histories are drawn as a line in space-time. Strings occupy lines in space-time at any one point. This gives it a two-dimensional history... (full context)

The anthropic principle suggests life is only possible in space-times with the four flat dimensions we are used to. String theory allows some regions of... (full context)

...the different dimensions. In 1994, scientists discovered dualities, which produce the same effects in four-dimensional space-time from various configurations. They also found p-branes, which take up two or more dimensions in... (full context)