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Learn how Einstein's theory of general relativity has been tested by various phenomena, such as the perihelion precession of Mercury, the bending of light, the gravitational redshift, and the gravitational waves. The web page explains the classical tests proposed by Einstein in 1915 and the modern tests in the weak and strong field limits.
Zero-point energy is the lowest possible energy that a quantum mechanical system may have, even at absolute zero. It arises from the uncertainty principle and the vacuum fluctuations of matter and force fields, and has implications for cosmology, physics and chemistry.
Learn how quantum mechanics and special relativity are combined to form relativistic quantum mechanics, which describes the behavior of particles at high velocities and predicts antimatter, spin and fine structure. Explore the different formulations, equations and applications of RQM in physics.
Isaac Newton was a mathematician, physicist, astronomer, alchemist, theologian, and author who formulated the laws of motion and universal gravitation. He published his findings in the Principia, which explained the Solar System's heliocentricity and the motion of objects on Earth and celestial bodies.
Bell's theorem shows that quantum mechanics is incompatible with local hidden-variable theories, which assume that particles have properties before measurement and are not influenced by distant events. Learn the mathematical derivation, experimental tests, and implications of Bell's theorem and its variations.
The Fermi paradox is the discrepancy between the lack of evidence of extraterrestrial life and the apparent high likelihood of its existence. It is also known as the Great Silence or silentium universi, and was first raised by physicist Enrico Fermi in 1950.
A uniform 4-polytope (or polychoron) is a 4-dimensional polytope with vertex-transitive cells and regular faces. Learn about its history, classification, symmetry, and properties from this comprehensive article.
Marie Curie was a Polish-born French physicist and chemist who pioneered research on radioactivity. She won the 1903 Nobel Prize in Physics and the 1911 Nobel Prize in Chemistry, becoming the first woman to win multiple Nobel Prizes and the only one to win in two sciences.