https://en.wikipedia.org/wiki/Spacetime
In physics, spacetime is a mathematical model that fuses the three dimensions of space and the one dimension of time into a single four-dimensional continuum. Spacetime diagrams are useful in visualizing and understanding relativistic effects such as how different observers perceive where and when events occur.

https://www.britannica.com/science/space-time
Space-time, in physical science, single concept that recognizes the union of space and time, first proposed by the mathematician Hermann Minkowski in 1908 as a way to reformulate Albert Einstein's special theory of relativity (1905). Learn more about space-time in this article.

https://www.livescience.com/space-time.html
Space-time is the conceptual model that best explains how the universe works.(Image credit: Shutterstock) Jump to: Discovery. How space-time works. Remaining mysteries. Additional resources. The

https://www.nature.com/articles/d41586-018-05095-z
Atoms of Spacetime. Heat is the random motion of microscopic parts, such as the molecules of a gas. Because black holes can warm up and cool down, it stands to reason that they have parts—or

https://einstein.stanford.edu/SPACETIME/spacetime2.html
Flat (Minkowski) spacetime is a trivial example, but empty spacetime can also be curved, as demonstrated by Willem de Sitter in 1916. There are even spacetimes whose distant reaches rotate endlessly around the sky relative to an observer's local inertial frame (as discovered by Kurt Gödel in 1949).

https://www.scientificamerican.com/article/what-is-spacetime-really-made-of/
Spacetime may not be fundamental, but emerge from more basic components of nature. Learn how string theory, holography and wormholes suggest a radical new way of thinking about space and time.

https://brilliant.org/wiki/spacetime/
Learn what spacetime is and how it relates space and time in physics. Explore how spacetime varies for different observers, how it is measured, and how it is bent by gravity.

https://ocw.mit.edu/courses/8-20-introduction-to-special-relativity-january-iap-2021/resources/lecture-1-2/
Learn how 19th century physicists and Albert Einstein thought about space and time, and how they led to the concept of spacetime. Watch a guest lecture by Prof. David Kaiser, a historian of science at MIT.

https://www.feynmanlectures.caltech.edu/I_17.html
17-1 The geometry of space-time. The theory of relativity shows us that the relationships of positions and times as measured in one coordinate system and another are not what we would have expected on the basis of our intuitive ideas. It is very important that we thoroughly understand the relations of space and time implied by the Lorentz

https://www.britannica.com/topic/Albert-Einstein-on-Space-Time-1987141
The revolution experienced by modern physics began to be reflected in the 12th edition (1922) of the Encyclopædia Britannica with Sir James Jeans 's article "Relativity.". In the 13th edition (1926) a wholly new topic, "Space-Time," was discussed by the person most qualified in all the world to do so, Albert Einstein.

https://www.youtube.com/channel/UC7_gcs09iThXybpVgjHZ_7g
Space Time explores the outer reaches of space, the craziness of astrophysics, the possibilities of sci-fi, and anything else you can think of beyond Planet Earth with our astrophysicist host

https://www.space.com/17661-theory-general-relativity.html
What is general relativity? General relativity is a physical theory about space and time and it has a beautiful mathematical description. According to general relativity, the spacetime is a 4

https://simple.wikipedia.org/wiki/Spacetime
Spacetime. An illustration of the spacetime curvature caused by Earth. Spacetime or space-time is a mathematical model that joins space and time into a single idea called a continuum. This four-dimensional continuum is known as Minkowski space. Combining these two ideas helped cosmology to understand how the universe works on the big level (e

https://www.scientificamerican.com/article/what-is-spacetime/
Explore the complex and mysterious nature of spacetime, the fabric of reality that combines space and time. Learn how physicists try to unravel its secrets with quantum gravity, black holes and information paradox.

https://physics.info/space-time/
Learn about the concept of space-time in physics, how it relates to relativity, and how it differs from classical notions of space and time. Explore the historical context, the postulates, the problems, the solutions, and the consequences of Einstein's theory of relativity.

https://www.britannica.com/science/relativity/Curved-space-time-and-geometric-gravitation
curved space-time. The four dimensional space-time continuum itself is distorted in the vicinity of any mass, with the amount of distortion depending on the mass and the distance from the mass. Thus, relativity accounts for Newton's inverse square law of gravity through geometry and thereby does away with the need for any mysterious "action

https://www.skyatnightmagazine.com/space-science/what-is-spacetime
What is spacetime, and is time really all a matter of perspective? Find out in our beginner's guide to the complexities of time and space.

https://phys.libretexts.org/Bookshelves/Relativity/Special_Relativity_(Crowell)/01%3A_Spacetime/1.01%3A_Three_Models_of_Spacetime
Learning Objectives. Discuss the three models of spacetime. Aristotelian spacetime. Galilean spacetime. Einstein's spacetime. " The test of a first-rate intelligence is the ability to hold two opposing ideas in mind at the same time and still retain the ability to function. " —F. Scott Fitzgerald.

https://www.khanacademy.org/science/physics/special-relativity/minkowski-spacetime/v/introduction-to-special-relativity-and-minkowski-spacetime-diagrams
As for the special relativity theory, GPS systems and jets moving around the Earth with superclocks inside were used to show that it also holds. Also, the Michelson-Morley experiment was repeated countless times, it intended to show how light speed wasn't absolute. The experiment never succeeds in doing so.

https://writings.stephenwolfram.com/2015/12/what-is-spacetime-really/
Wolfram argues that spacetime is not a fundamental concept, but emerges from a simple program that operates on a network of nodes and connections. He challenges the traditional mathematical approach of physics and proposes a new computational framework based on his Wolfram Language.

https://www.pbs.org/show/pbs-space-time/
Watch astrophysicist Matt O'Dowd explore the mysteries of the universe in PBS <strong>Space Time,</strong> the biggest physics and space show on YouTube. Learn about black holes, dark energy, alien life, quantum mechanics and more in this educational and entertaining series.

https://phys.libretexts.org/Courses/Skidmore_College/Introduction_to_General_Relativity/01%3A_Special_Relativity/1.02%3A_The_Spacetime_Interval
An invariant is a quantity that has the same value for all observers. For constant velocity motion in flat spacetime (we will discuss what that means later), the spacetime interval is. c2Δτ2 = c2Δt2 − Δx2 − Δy2 − Δz2., (1.2.1) where c = 3 ×108 m/s is the speed of light. The coordinates t, x, y, and z mark an event that depends on

https://www.quantamagazine.org/how-to-think-about-relativitys-concept-of-space-time-20221114/
Learn how Einstein and Minkowski revolutionized our understanding of space and time with their theories of special and general relativity. Explore the concepts of space-time, length contraction, time dilation, gravity and more.