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	AllRefer.com - space-time (Physics) - Encyclopedia
		space-time, central concept in the theory of relativity that replaces the earlier concepts of space and time as separate absolute entities.
		In relativity one cannot uniquely distinguish space and time as elements in descriptions of events.
		Space and time are joined together in an intimate combination in which time becomes the "fourth dimension." The mathematical formulation of the theory by H. Lorentz (see Lorentz contraction) preceded the interpretation by A. Einstein that space and time are not absolute.
	reference.allrefer.com /encyclopedia/S/spacetim.html (315 words)

	Spacetime - Wikipedia, the free encyclopedia
		In physics, spacetime is a model that combines space and time into a single coordinate system called the space-time continuum.
		Here, time is expressed in the same units as space by multiplying time measurements by the speed of light.
		The shortest path between any two points in a space time is called a geodesic (of the spacetime).
	en.wikipedia.org /wiki/Space-time (1219 words)

	Time [Internet Encyclopedia of Philosophy]
		If physical time, psychological time, and biological time are three different kinds of time, then three answers are required to the question "What is time?" and some commentary is required regarding their relationships, such as whether one is the most fundamental.
		Spacetime is four-dimensional and a continuum, with time being a distinguished, one-dimensional sub-space of this continuum.
		Proper time along a worldline in 4-d spacetime is the time elapsed by an object having that worldline, as shown on an ideal clock having the same worldline.
	www.utm.edu /research/iep/t/time.htm (15801 words)

	Learn more about Spacetime in the online encyclopedia. (Site not responding. Last check: 2007-10-07)
		In special relativity and general relativity, time and three-dimensional space are treated together as a single four-dimensional manifold called spacetime (alternatively, space-time; see below).
		Just as the x, y, z coordinates of a point depend on the axes one is using, so distances and time intervals, invariant in Newtonian physics, may depend on the reference frame of an observer, in relativistic physics.
		A spacetime interval between two events is the frame-invariant quantity analogous to distance in Euclidean space.
	www.onlineencyclopedia.org /s/sp/spacetime.html (714 words)

	Space and Time
		For example, the times measured by two clocks are related by the time-dilation formula given earlier.
		Space and time are still the arena where Nature unfolds.
		The development of our ideas of space and time from being independent of each other and imperturbable, to being meshed into space-time system, to being a dynamical object is one of the most profound developments derived from the general and special theories of relativity.
	phyun5.ucr.edu /~wudka/Physics7/Notes_www/node81.html (438 words)

	Space Time Mass Home Page
		The estimated equivalent mass of space-time (density) is calculated to be approximately one to 1000 times the mass of one electron per cubic meter.
		This hypothesis, which we call space-time-mass unified theory, explains a universe in which everything (i.e., matter, energy, space, time) is all made of each other and are all from one nature.
		According to him (and the science of that time) air has no mass or pressure.(since air goes to infinity!!, any mass or pressure would crush everything!!) The wind, heat, cold, birds' ability to fly, and sound were all explained by levitation force, heat force, etc., which were all inaccurate.
	www.space-time-mass.com (510 words)

	Scientists Obtain Evidence Earth's Spin Twists Space-Time Around It
		An international research team has found the first direct evidence that the Earth is dragging space and time around itself as it rotates, like a spoon spinning in honey.
		This swirling of space and time around a massive object was first suggested by German physicist Albert Einstein in his General Theory of Relativity.
		Physicist Michael Salamon of the U.S. space agency NASA elaborates on the analogy of the spoon in a honey jar.
	www.voanews.com /english/2004-10-21-voa131.cfm (796 words)

	space-time -- Encyclopædia Britannica
		The United States experienced a frustrating year in space exploration in 1993 as several key satellites were lost, space shuttle launches were delayed five times, and the space station was drastically cut in size.
		To the bioscientist the idea of time may include the body's natural time cycles, such as the daily cycles of...
		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.
	www.britannica.com /eb/article-9068970 (864 words)

	Professor Stephen Hawking
		In science fiction, space and time warps are a commonplace.
		However, if the three-dimensional space, were really the surface of a sphere in another dimension, its volume would be large but finite.
		It could describe curved spaces that existed in the abstract, but there seemed no reason why the physical space we lived in, should be curved.
	www.hawking.org.uk /lectures/warps.html (883 words)

	Space-Time Engineering (Site not responding. Last check: 2007-10-07)
		Time travel may appear even more outrageous than FTL, but both phenomena are closely linked to each other.
		Time machines and the Principle of Self-Consistency as a consequence of the Principle of Stationary Action (II): the Cauchy problem for a self-interacting relativistic particle.
		Quantum effects and the principle of minimal action may lead to a 'principle of self-consistency' ruling out time paradoxes.
	www.aleph.se /Trans/Tech/Space-Time (849 words)

	The Hole Argument
		In that context, space and time are fused into a single entity, spacetime, and we inquire into its status.
		Just as a geometric point is a particular spot in a geometrical space, an event is a particular point in a cosmological space at a particular time.
		In their celebrated debate over space and time, Leibniz taunted the substantivalist Newton's representative, Clarke, by asking how the world would change if East and West were switched.
	plato.stanford.edu /entries/spacetime-holearg (5340 words)

	SPACE.com -- Gravity Probe B: Delay in Space and Time
		Decades in the making, a space probe that delves into Albert Einstein's general theory of gravitation remains grounded on Earth, caught in its own space-time continuum of technical snags, costly delays, and threats of cancellation.
		Gravity Probe B is an experiment developed by NASA and Stanford University to precisely test two predictions of Albert Einstein's general theory of relativity, measuring how space and time are warped by the presence of the Earth and how the Earth's rotation drags space-time around with it.
		Astrosociology is the study of astrosocial phenomena (social/cultural patterns related to space), a multidisciplinary field open to all scientists and engineers interested in "space and society" issues.
	space.com /businesstechnology/technology/gravity_probe_b_031231.html (1624 words)

	TIME and LIFE Space: Space Stations
		For NASA, a shot into space provides a shot in the arm, as John Glenn at last returns to orbit.
		In 73 seconds, a new era in space travel explodes into a searing nightmare.
		The TIME Cover Story from April 27, 1981 on the shuttle's first orbital flight.
	www.time.com /time/reports/space/shuttle.html (271 words)

	BBC - Science & Nature - Space - Time Travel
		Einstein's theory of relativity brought space and time together in a single, four-dimensional arrangement that he called spacetime.
		Supposedly it was Dr Who's Timelords who first harnessed the power of a fl hole to begin their experiments in time travel.
		Another option for future time travellers would be somehow to harness these tiny wormholes and expand them.
	www.bbc.co.uk /science/space/exploration/timetravel/index.shtml (1025 words)

	Space-Time-Chance
		For a long time, it was thought that the phenomena of organic chemistry were governed by principles qualitatively different from those of inorganic chemistry.
		Relativity tells us that space and time are aspects of space-time, so it is primitive to picture God in time.
		And quantum theory tells us that space, time, and chance are part of space-time-chance, so it is primitive to picture God as subject to uncertainty.
	www.math.princeton.edu /~nelson/papers/cti.html (1593 words)

	NTNU JAVA :: View topic - Space and Time in Special Relativity (Site not responding. Last check: 2007-10-07)
		The speed of light in empty space is the same for all inertial frames.
		This java applet invites you to the world of space and time in special relativity.
		Time is relative, it depends on the space (coordinate system).
	www.phy.ntnu.edu.tw /java/relativity/relativity.html (744 words)

	Inquiring Minds (Site not responding. Last check: 2007-10-07)
		Physicists are still far from understanding why a proton has about 2,000 times more mass than an electron.
		Empty space, we have discovered, is actually not empty at all.
		And space itself can either be almost flat or curved, depending on the amount of matter it contains.
	www.fnal.gov /pub/inquiring/matter (383 words)

	Space-Time Diagrams (Site not responding. Last check: 2007-10-07)
		The usual convention is that time runs up the diagram, so the bottom is the past, or early times, and the top is the future, or late times.
		A point on this graph describes both a position (the horizontal or x coordinate) and a time (the vertical or t coordinate).
		This figure uses perspective to try to show two spatial dimensions and the time axis on a two dimensional sheet of paper, but usually we will just show one spatial axis and avoid perspective.
	www.astro.ucla.edu /~wright/st_diags.htm (312 words)

	Kant, Immanuel (1724-1804) : Routledge Encyclopedia of Philosophy Online
		Next, in the 'Transcendental Exposition', Kant argues that we must have an a priori intuition of space because 'geometry is a science which determines the properties of space synthetically and yet a priori' (B 40).
		That is, the propositions of geometry describe objects in space, go beyond the mere concepts of any of the objects involved - thus geometric theorems cannot be proved without actually constructing the figures - and yet are known a priori.
		Since they therefore cannot be properties of things in themselves, there is no alternative but that space and time are merely the forms in which objects appear to us.
	www.rep.routledge.com /article/DB047SECT5 (515 words)

	Minkowski invented this spacetime triangle to graphically illustrate Einstein's space-time invariance. Einstein unified ...
		Einstein unified space and time for his theory of relativity, so Minkowski forced them to graphical equality and invariance.
		Time is an imaginary space dimension of Minkowski's spacetime triangle.
		Time is also a real time dimension of his spacetime triangle.
	www.quantonics.com /Einstein_Minkowski_Space_Time_Diagram.html (1022 words)

	Amazon.com: Books: Eyewitness: Time & Space (Site not responding. Last check: 2007-10-07)
		Unless, that is, you twist the ends of a wormhole around several times and drive a rocket through it, traveling back to a time before you ever cracked an egg.
		In Time & Space, part of the Eyewitness Science series, you'll learn all about time travel, wormholes, and all the ways that the universe is thought to be constructed.
		This means there are parallel dimensions happening trillions at a time when someone makes a choice and goes up that "root" in time, also known as "quantam universes".
	www.amazon.com /exec/obidos/tg/detail/-/0789455781?v=glance (942 words)

	Space-Time Links (old) (Site not responding. Last check: 2007-10-07)
		"...time and space are modes by which we think and not conditions in which we live."
		The Nature of Space and Time (Hawking and Penrose)
		Time travel, in a new light (Boston Globe)
	www.space-time.info /links/ScienceLinks.html (353 words)

	Space Time
		Space Time will be playing at the Galaxy Club on Friday, October 14th.
		Be sure to come and check out ALL the bands if you can- this is sure to be a great show at one of the better Dallas area clubs.
		We know from experience that past recordings come back to haunt you, so we want it to be done right.
	www.spacetimeband.com (156 words)

	Space & Time
		Welcome to the homepage for Physics 127: Space and Time.
		This page has a very nice description of Aristotle's views of space and time and his (incorrect) theories of how the world works.
		Newton's Laws and his view of space and time.
	info.hartwick.edu /physics/spacetime.html (745 words)

	SPACE.com -- Matter Rides Black Hole's Space-Time Wave
		Any object with mass warps the space and time around it, in much the same way a heavy object deforms a stretched elastic sheet.
		It is the first time material has been observed making a complete orbit so close to a fl hole, said study member Lance Miller of Oxford University.
		Miller and his colleague, study leader Jane Turner of NASA and the University of Maryland Baltimore County, acknowledged that similar but tentative results were announced in September by a European group.
	www.space.com /scienceastronomy/aas_blackhole_050110.html (1049 words)

	Space Weather Resources
		If you would like to subscribe to our space weather mailing list, just go to the Rice University Lists and subscribe to the SPACALRT Mailing List or send an e-mail to this address this address.
		Space Weather: A Research Perspective (A good overview; PDF; New March 21, 1997.)
		Space Physics WWW Reference (Education section) (General) (Overseas: Finland)
	space.rice.edu /ISTP (529 words)

	space-time on Encyclopedia.com
		central concept in the theory of relativity that replaces the earlier concepts of space and time as separate absolute entities.
		Bibliography: See E. Taylor and J. Wheeler, Spacetime Physics (1966); N. Mermin, Space and Time in Special Relativity (1968).
		The spaces and times of globalization: place, scale, networks, and positionality *.
	www.encyclopedia.com /html/s1/spacetim.asp (497 words)

	Sample CD Rom and Virtual Instrument 's from Time+Space Online
		Welcome to Time + Space, your No.1 source for Sample CD Rom 's, Virtual Instrument 's and Music Software.
		Since Day One, Time + Space have been bringing inspiration to musicians with their world-class sample libraries.
		With their virtual instrument 's, they have now dramatically expanded the possibilities, by integrating the world of software technology with their renowned expertise in sound design.
	www.timespace.com (250 words)

	Amazon.com: Books: Space, Time & Medicine (Site not responding. Last check: 2007-10-07)
		Despite this critique, however, Dossey does present several interesting arguments in favor of his approach, and some fascinating case studies, including one involving a psychic police officer suffering from stress-related illness, and some interesting observations involving the health of people with "type A" personalities and worldviews.
		"Space, Time, and Medicine" isn't beach reading, doesn't present any revolutionary new data, and won't shake the ground beneath your feet.
		This book brilliantly describes the essence of how various illnesses may be brought on by our misperceptions of space and time, and what we can do to change our perecpeptions and heal ourselves.
	www.amazon.com /exec/obidos/tg/detail/-/0394710916?v=glance (1184 words)

	ScienceDaily: Space & Time News
		NASA Discovers Life's Building Blocks Are Common In Space (October 13, 2005) — After A team of NASA exobiology researchers revealed today organic chemicals that play a crucial role in the chemistry of life are common in space.
		Researchers Find A Potential Key To Human Immune Suppression In Space (October 13, 2005) — Researchers at the San Francisco VA Medical Center have identified a set of key immune-response genes that do not turn on in a weightless environment.
		Titan's Enigmatic Infrared-Bright Spot Is Surface Make-Up (October 11, 2005) — A 300-mile-wide patch that outshines everything else on Titan at long infrared wavelengths appears not to be a mountain, a cloud or a geologically active hot spot, University of Arizona scientists...
	www.sciencedaily.com /news/space_time.htm (275 words)

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