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{{Redirect|Physical distance|the general concept|Distance (physics)}} ...qual at the present time. At other times, the Universe's expansion results in the proper distance changing, while the comoving distance remains constant. ...

...ate]] of an electric stove to the bottom of a saucepan in contact with it. In the absence of an opposing external driving energy source, within a body or ...usion|diffusion]] of molecules during their [[random motion]]. [[Photons]] in this context do not collide with one another, and so heat transport by [[el ...

...Spacetime diagram]]s are useful in visualizing and understanding [[Special relativity|relativistic]] effects such as how different observers perceive ''where'' a ...the [[Lorentz transformation]] and [[Special relativity|special theory of relativity]]. ...

{{short description|Change of wavelength in photons during travel}} ...upercluster]] of distant galaxies (right), as compared to absorption lines in the visible spectrum of the [[Sun]] (left). Arrows indicate redshift. Wavel ...

...[sequence]] of [[existence]] and [[event (philosophy)|events]] that occurs in an apparently [[irreversible process|irreversible]] succession from the [[p ...ries:Time |quote=The indefinite continued progress of existence and events in the past, present, and future regarded as a whole |date=2011 |publisher=Oxf ...