space-time --� Encyclop�dia Britannica


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40090 Encyclopædia Britannica articles, from the full 32 volume encyclopedia
>	space-time in physical science, single concept that recognizes the union of space and time, posited by Albert Einstein in the theories of relativity (1905, 1916).
>	space a boundless, three-dimensional extent in which objects and events occur and have relative position and direction.
>	Hubble Space Telescope the most sophisticated optical observatory ever placed into orbit around the Earth. The Earth's atmosphere obscures ground-based astronomers' view of celestial objects by absorbing or distorting light rays from them. A telescope stationed in outer space is entirely above the atmosphere, however, and receives images of much greater brightness, clarity, and detail than do ...
>	space exploration the investigation, by means of manned and unmanned spacecraft, of the reaches of the universe beyond Earth's atmosphere and the use of the information so gained to increase knowledge of the cosmos and benefit humanity.
>	space law the body of regulations in international law that governs conduct in and related to areas of space above Earth's lower atmosphere.
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9465 Student Encyclopedia Britannica articles, specially written for elementary and high school students
	Curved space-time a concept put forth by Albert Einstein in his general theory of relativity, in which the presence of matter and gravitational fields distorts space and makes it curve. The rules of geometry in the four dimensions of curved space-time differ from those of three-dimensional Euclidean geometry. Einstein accurately predicted that light waves would bend while nearing a large ...
	time In our ordinary lives we experience the flow of time as being sometimes fast and sometimes slow, depending on how intent we are on our activities. Physical scientists and engineers use time as a standard against which they can measure how long something takes. To the bioscientist the idea of time may include the body's natural time cycles, such as the daily cycles of ...
	space exploration The exploration of space is among the most fascinating ventures of modern times. It has carried first instruments, then people themselves, beyond the Earth's atmosphere, into a remoteness that until relatively recently was hardly known or understood. Although its borders already have been crossed, space still holds mysteries and, undoubtedly, surprises beyond number.
	Variable Space and Time from the relativity article This meant accepting the Lorentz contraction (corresponding to the Flatlander's contracted yardstick) except that Einstein removed the unprovable feature. Lorentz had suggested a contraction of matter, and this had not been found. Einstein proposed that the dimensions of space itself change with an observer's speed.
	Relativity and time. from the time article Albert Einstein's special theory of relativity challenged all conventional ideas about time. One of the cornerstones of this theory is that the speed of light is the same for all observers. A consequence of this rule is that time is not constant: clocks run at different rates for different observers depending on the relative motion of the clocks and observers. For ...
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2203 web sites, chosen by Britannica editors for our Internet Guide
>	Amazing Space Interactive lessons and web-based activities on astronomy for students and teachers prepared in collaboration with scientists from the Space Telescope Science Institute, Maryland, U.S. Covers galaxies, stars, meteors, black holes, stars, and astronauts, NICMOS, STIS, and the history of telescopes from the time of Galileo. Provides photographs taken by the Hubble Space Telescope.
>	Space Future Discussion on the prospect of expanding beyond earth. Details the commercial utilization of space in times to come, by developing human settlements and various industries, including tourism. Mentions the other activities that could be promoted in this limitless expanse.
>	Time to Privatize NASA The Cato Institute Opinion editorial by Edward Hudgins (Jan. 26, 1998) maintaining that NASA decided to send former astronaut John Glenn into space again, to distract attention from the agency's high expenses. Suggests that private enterprise could do a superior job of exploring space with lower costs. Concludes that progress toward commercial space travel will come only when private industry is permitted to explore the possibility.
>	Myth and Legend from Ancient Times to the Space Age "Collection of annotated links to resources in mythology, folklore, and legends. Also covers archeology, astronomy, religion, and catastrophism."
>	The Light Cone "Department of Physics, Syracuse University" "Tutorial on space, time, gravity and relativity that covers Aristotle's, Galileo's, and Newton's theories. Includes space-time diagrams and a bibliography."
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70 video and media
>	Albert Einstein: Time and Space(1:01) Einstein's theory of relativity changed the way we look at time and space.
>	Space Stations: Planning for Space Colonies(2:02) Scientist are planning future space stations where astronauts can live and work for months at a time.
>	Indonesia: Sense of Time( 00:55) Learn what Indonesians mean by 'rubber time'.
>	Inn Keeping: Cost and Time(2:02) The amount of money and time spent building a website for an inn depends on a couple of factors.
>	Power of Play: Unstructured Time( 00:56) Experts explain why children need time for spontaneous, unstructured play.
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space-time

by Albert Einstein