Copyright © Philip M. Parker, INSEAD. Terms of Use.
| Domain | Definition |
Physics | Stretching of time produced by relativity. Time dilation is a predicted effect of the cosmological paradigm. (references) |
Source: compiled by the editor from various references; see credits. | |
(From Wikipedia, the free Encyclopedia)
| %c | Length contraction | Relativistic Mass | Time dilation |
|---|---|---|---|
| 0 | 1.000 | 1.000 | 1.000 |
| 10 | 0.995 | 1.005 | 0.995 |
| 50 | 0.867 | 1.155 | 0.867 |
| 90 | 0.436 | 2.294 | 0.436 |
| 99 | 0.141 | 7.089 | 0.141 |
| 99.9 | 0.045 | 22.366 | 0.045 |
Taken to the extreme, an observer travelling at the speed of light (which, according to special relativity, is impossible for any object with a non-zero rest mass) would be all but frozen with respect to the outside world. Massless particles (which are forced by relativity to travel at the speed of light) include photons and gluons. Recently it was determined that neutrinos have a mass, unlike previously thought.
Gravitational time dilation is a verified effect of general relativity, and has been experimentally measured using atomic clocks on airplanes. The clocks that travelled aboard the airplanes were slightly fast with respect to clocks on the ground. The effect is significant enough that the Global Positioning System needs to correct for its effect on clocks aboard artificial satellites, providing a further experimental confirmation of the effect. Time dilation due to velocity is negligible in both cases.
An extreme example of gravitational time dilation occurs near a black hole. A clock falling towards the event horizon would appear (to observers far away) to slow down to a halt as it approached the horizon. A small and sturdy enough clock could conceivably cross the horizon without suffering adverse effects at the horizon, but to far away observers it would "freeze" and be flattened out on the horizon.
Time dilation could make it possible to travel "into the future": if we could accelerate a starship enough, one year aboard the ship might correspond to ten years outside. Indeed, a constant 1g acceleration would permit humans to circumnavigate the known Universe (with a radius of some 15 billion light years) in under a subjective lifetime. A more likely use of this effect would be to enable humans to travel to nearby stars without spending their entire lives aboard the ship. However, any such use of this effect would require an entirely new method of propulsion. A relativistically accelerated object also gains mass, so further acceleration would require increased amounts of fuel. A further problem with relativistic travel is that the interstellar medium would turn into a stream of cosmic rays that would fry the ship unless stark radiation protection measures were taken.Gravitational time dilation
Time dilation and space flight
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Time dilation."
Crosswords: TIME DILATION |
| Specialty definitions using "TIME DILATION": cosmological distance. (references) |
Scrabble® Enable2K-Verified Anagrams | |
Direct Anagrams: delimitation. | |
| Words within the letters "a-d-e-i-i-i-l-m-n-o-t-t" | |
-2 letters: intimidate, limitation, meditation. | |
-3 letters: diatomite, dietitian, imitation, initialed, initiated, intimated, mediation, militated. | |
-4 letters: antidote, delation, dilation, dominate, ideation, imitated, initiate, intimate, intitled, iodinate, limonite, melanoid, militant, militate, tetanoid, tolidine. | |
-5 letters: ailment, aliment, amidine, amidone, amniote, delimit, diamine, dominie, edition, elation, imitate, inedita, initial, intimae, intimal, intitle, lentoid, lianoid, limited, lomenta, mantled, mantlet, matelot, mattoid. | |
| Words containing the letters "a-d-e-i-i-i-l-m-n-o-t-t" | |
+1 letter: delimitations. | |
+2 letters: delegitimation. | |
+3 letters: delegitimations. | |
+4 letters: demilitarization, indomitabilities, multidirectional. | |
+5 letters: dematerialization, demilitarizations, demonstrabilities, tridimensionality. | |
| Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. | |
Hexadecimal (or equivalents, 770AD-1900s) (references)54 49 4D 45 44 49 4C 41 54 49 4F 4E |
| Leonardo da Vinci (1452-1519; backwards) (references)
|
Binary Code (1918-1938, probably earlier) (references)01010100 01001001 01001101 01000101 00100000 01000100 01001001 01001100 01000001 01010100 01001001 01001111 01001110 |
HTML Code (1990) (references)T I M E   D I L A T I O N |
ISO 10646 (1991-1993) (references)0054 0049 004D 0045 0044 0049 004C 0041 0054 0049 004F 004E |
Encryption (beginner's substitution cypher): (references)5443473923843463554434948 |
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Copyright © Philip M. Parker, INSEAD. Terms of Use.
