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  1. Vor 4 Stunden · In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between space and time. In Albert Einstein 's 1905 treatment, the theory is presented as being based on just two postulates: [p 1] [1] [2] The laws of physics are invariant (identical) in all inertial frames of reference ...

  2. Vor 4 Stunden · This represents the set of locations in space at which the decoupling event is estimated to have occurred and at a point in time such that the photons from that distance have just reached observers. Most of the radiation energy in the universe is in the cosmic microwave background, [60] making up a fraction of roughly 6 × 10 −5 of the total density of the universe.

  3. Vor einem Tag · Space exploration is the use of astronomy and space technology to explore outer space. [1] While the exploration of space is currently carried out mainly by astronomers with telescopes, its physical exploration is conducted both by uncrewed robotic space probes and human spaceflight. Space exploration, like its classical form astronomy, is one ...

  4. en.wikipedia.org › wiki › OntologyOntology - Wikipedia

    Vor einem Tag · A description in Minkowski space supports descriptions in time and space for particular observers. It is part of the aim of the philosophy of an ontology such as Whitehead's that the actual entities should be all alike, qua actual entities; they should all satisfy a single definite set of well stated ontological criteria of actuality.

  5. Vor 4 Stunden · Space exploration, as predicted in August 1958 by the science fiction magazine Imagination. Science fiction (sometimes shortened to SF or sci-fi) is a genre of speculative fiction, which typically deals with imaginative and futuristic concepts such as advanced science and technology, space exploration, time travel, parallel universes, and extraterrestrial life.

  6. Vor 4 Stunden · That is a real molecule, the carbyne; which has some characteristics of nanotubes (such as orbital hybridization, high tensile strength, etc.) — but has no hollow space, and may not be obtainable as a condensed phase. The pair (2,0) would theoretically yield a chain of fused 4-cycles; and (1,1), the limiting "armchair" structure, would yield a chain of bi-connected 4-rings. These structures ...

  7. Vor einem Tag · Chrysler lauded this achievement, saying, "It is the first time that any structure in the world has reached such a height, yet the entire steel construction was accomplished without loss of life". In total, 391,881 rivets were used, [166] and approximately 3,826,000 bricks were laid to create the non-loadbearing walls of the skyscraper. [167]