4 days ago · The speed of gravitational waves in the general theory of relativity is equal to the speed of light in a vacuum, c. Within the theory of special relativity, the constant c is not only about light; instead it is the highest possible speed for any interaction in nature.
Jul 20, 2021 · We Should Explore Alternatives to the Standard Model. The standard theory of cosmology is called the Lambda cold dark matter (ΛCDM) model. As that name suggests, the theory postulates the existence of dark matter – a mysterious substance that (according to the theorists) comprises the bulk of the matter in the Universe. It is widely embraced.
Jul 22, 2021 · Crash test dummies help improve safety of moon explorers (Image credit: NASA) Monday, June 28, 2021: A crash test dummy being prepared for an impact test in the Orion space capsule at NASA’s ...
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Jul 19, 2021 · Quantum entanglement occurs when a system of multiple particles in quantum mechanics interact in such a way so that the particles cannot be described as independent systems but only as one system as a whole. Measurement (e.g. of the spin of an entangled electron) may instantaneously affect another electron's spin at an arbitrarily distant location, apparently (but not actually) faster than ...
5 days ago · The theory that the Sun is the center around which the planets orbit was first proposed by the ancient Greek Aristarchus of Samos in the 3rd century BC, and later adopted by Seleucus of Seleucia (see Heliocentrism). This view was developed in a more detailed mathematical model of a heliocentric system in the 16th century by Nicolaus Copernicus.
3 days ago · Roger Bacon was born in Ilchester in Somerset, England, in the early 13th century, although his date of birth is sometimes narrowed down to c. 1210, "1213 or 1214", or "1215". However, modern scholars tend to argue for the date of c. 1220, but there are disagreements on this. The only source for his birth date is a statement from his 1267 Opus ...
4 days ago · Bell's theorem proves that quantum physics is incompatible with local hidden-variable theories.It was introduced by physicist John Stewart Bell in a 1964 paper titled "On the Einstein Podolsky Rosen Paradox", referring to a 1935 thought experiment that Albert Einstein, Boris Podolsky and Nathan Rosen used to argue that quantum physics is an "incomplete" theory.
3 days ago · In the theory of finite groups the Sylow theorems imply that, if a power of a prime number divides the order of a group, then the group has a subgroup of order . By Lagrange's theorem , any group of prime order is a cyclic group , and by Burnside's theorem any group whose order is divisible by only two primes is solvable .
Jul 23, 2021 · Dream cheating scandal – explaining ALL the math simply. Recently, a very popular Minecraft player Dream got caught cheating in his speedrunning attempt by the moderation team. The moderation team did a mathematical analysis, and Dream tried to debunk the math used by hiring an astrophysicist, but the math used in astrophysicist’s paper was ...