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" ... A light-clock, formed by a photon bouncing between two mirrors, will define time for any observer. ... [+] Although the two observers may not agree with one another on how much time is passing, they will agree on the laws of physics and on the constants of the Universe, such as the speed of light. A stationary observer will see time pass normally, but an observer moving rapidly through space will have their clock run slower relative to the stationary observer. ... "
" ... A light-clock, formed by a photon bouncing between two mirrors, will define time for any observer. ... [+] Although the two observers may not agree with one another on how much time is passing, they will agree on the laws of physics and on the constants of the Universe, such as the speed of light. Most importantly, time always appears to run forward, never backwards. ... "
" ... Interest in crafting the most effective digital audio ads has increased in tandem with the rise of streaming music services, such as Spotify, Pandora and Apple Music. While some elements of radio advertising remain constants in this relatively new medium, there are significant distinctions between them. ... "
" ... This is the first time that two independent CMB measurements have found consistently lower Hubble constants than local Universe measurements. ... "
" ... To a large fraction of people, a Universe where space-and-time still exist, along with the laws of physics, the fundamental constants, and some non-zero field energy inherent to the fabric of space itself, is very much divorced from the idea of nothingness. We can imagine, after all, a location outside of space; a moment beyond the confines of time; a set of conditions that have no physical reality to constrain them. And those imaginings — if we define these physical realities as things we need to eliminate to obtain true nothingness — are certainly valid, at least philosophically. ... "