Search results
Results from the WOW.Com Content Network
In physics, gravity (from Latin gravitas 'weight' [1]) is a fundamental interaction primarily observed as a mutual attraction between all things that have mass.Gravity is, by far, the weakest of the four fundamental interactions, approximately 10 38 times weaker than the strong interaction, 10 36 times weaker than the electromagnetic force, and 10 29 times weaker than the weak interaction.
A definition of "matter" based on its physical and chemical structure is: matter is made up of atoms. [17] Such atomic matter is also sometimes termed ordinary matter. As an example, deoxyribonucleic acid molecules (DNA) are matter under this definition because they are made of atoms.
Philosopher Brian Leftow has argued that the question cannot have a causal explanation (as any cause must itself have a cause) or a contingent explanation (as the factors giving the contingency must pre-exist), and that if there is an answer, it must be something that exists necessarily (i.e., something that just exists, rather than is caused).
String theory is a model of physics whereby all "particles" that make up matter are composed of strings (measuring at the Planck length) that exist in an 11-dimensional (according to M-theory, the leading version) or 12-dimensional (according to F-theory [18]) universe. These strings vibrate at different frequencies that determine mass ...
ISBN 978-4757539808 (in Japanese) and No Matter How I Look at It, It’s You Guys' Fault I’m Not Popular! 4. July 2014. ISBN 978-0316376747 私がモテないのはどう考えてもお前らが悪い! 5. September 2013. ISBN 978-4757540644 (in Japanese) and No Matter How I Look at It, It’s You Guys' Fault I’m Not Popular! 5. October 2014.
Mass was traditionally believed to be a measure of the quantity of matter in a physical body, equal to the "amount of matter" in an object. For example, Barre´ de Saint-Venant argued in 1851 that every object contains a number of "points" (basically, interchangeable elementary particles), and that mass is proportional to the number of points ...
In general, this means that only part of the geometry of the slice can be given by the scientist, while the geometry everywhere else will then be dictated by Einstein's equations on the slice. [clarification needed] In the context of an asymptotically flat spacetime, the boundary conditions are given at infinity. Heuristically, the boundary ...
If dark matter is composed of weakly interacting particles, then an obvious question is whether it can form objects equivalent to planets, stars, or black holes. Historically, the answer has been it cannot, [e] [136] [137] [138] because of two factors: It lacks an efficient means to lose energy [136]