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Physics Galaxy was founded as an online learning portal by Ashish Arora. [2] It was founded as an initiative to coach students for free especially for those in rural areas, who cannot afford expensive coaching facilities. Later in 2011, a YouTube channel of the same name was founded. [3] [4]
A520 pictured in X-ray, optical, and an inferred mass distribution based on the observed weak gravitational lensing.Imaged April 2007. Abell 520 (also known as A520) is a galaxy cluster in the Orion constellation, located at a co-moving radial distance of 811 Mpc (2,645 Mly) and subtends 25 arcminutes on the Earth sky.
[3] [5] He has dedicated himself in training young minds in the field of Physics. He has immensely contributed to popularising Physics education among Indian students and teachers by conducting lectures and experimental demonstrations. He has been awarded the Maulana Abul Kalam Azad Shiksha Puruskar by the Bihar state government. [3] [6]
Modified Newtonian dynamics (MOND) is a theory that proposes a modification of Newton's second law to account for observed properties of galaxies.Its primary motivation is to explain galaxy rotation curves without invoking dark matter, and is one of the most well-known theories of this class.
Johannes Kepler as the first to closely integrate the predictive geometrical astronomy, which had been dominant from Ptolemy in the 2nd century to Copernicus, with physical concepts to produce a New Astronomy, Based upon Causes, or Celestial Physics in 1609.
The Collisionless Boltzmann equation, also called the Vlasov Equation is a special form of Liouville' equation and is given by: [3] + = Or in vector form: + = Combining the Vlasov equation with the Poisson equation for gravity: =. gives the Jeans equations.
The following is a list of notable unsolved problems grouped into broad areas of physics. [1]Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.
SN 1993J is a supernova observed in Bode's Galaxy.It was discovered on 28 March 1993 by F. Garcia in Spain. [3] At the time, it was the second-brightest type II supernova observed in the twentieth century behind SN 1987A, [4] peaking at a visible apparent magnitude of 10.7 on March 30, with a second peak of 10.86 on April 18.