null gravity
21General relativity — For a generally accessible and less technical introduction to the topic, see Introduction to general relativity. General relativity Introduction Mathematical formulation Resources …
22Mass in general relativity — General relativity Introduction Mathematical formulation Resources Fundamental concepts …
23Time travel — This article details time travel itself. For other uses, see Time Traveler. Time travel is the concept of moving between different moments in time in a manner analogous to moving between different points in space, either sending objects (or in… …
24Pp-wave spacetime — In general relativity, the pp wave spacetimes, or pp waves for short, are an important family of exact solutions of Einstein s field equation. These solutions model radiation moving at the speed of light. This radiation may consist of:*… …
25List of Ben 10 aliens — This is the list of all aliens of the Omnitrix and Ultimatrix showed in the Ben 10 universe Contents 1 Aliens introduced in Ben 10 1.1 Heatblast 1.2 Wildmutt 1.3 Diamondhead …
26Vorkosigan Saga — The Vorkosigan Saga is a series of science fiction novels and short stories set in a common fictional universe by American author Lois McMaster Bujold.[1] Most of these were published between 1986 and 2002, with the exceptions being “Winterfair… …
27List of Air Gear characters — This is a list of characters in the anime/manga series Air Gear. Contents 1 Major teams 1.1 Kogarasumaru 1.1.1 Itsuki Minami 1.1.2 Kazuma Mikura …
28Mass versus weight — The chains on the swing hold all the child’s weight. If one were to stand behind her at the bottom of the arc and try to stop her, one would be acting against her inertia, which arises purely from mass, not weight. In everyday usage, the mass of… …
29Penrose-Hawking singularity theorems — The Penrose Hawking singularity theorems are a set of results in general relativity which attempt to answer the question of whether gravity is necessarily singular. These theorems answer this question affirmatively for matter satisfying… …
30Criticism of relativity theory — Criticism of Albert Einstein s theory of relativity was mainly expressed in the early years after its publication on a scientific, pseudoscientific, philosophical, or ideological basis. Reasons for criticism were, for example, alternative… …
