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Showing content with the highest reputation on 08/19/19 in all areas

  1. Simple - Yes and no. I think. We know its got an arrow, we know it „bends” along with space under conditions which implies its got „interactive features” which further might imply that time is a thing. But that does not have to be true... just like space is volume, time might just be analogous to volume. On the other hand, we don’t even know if time had a beginning and it might not be a valid question whether there was a beginning to the Universe because conditions at t=0 were so much different from what we see now. Most theorerical physicists agree that GR has to be eventually complemented by a fuller theory and not just because we need to marry gravity under QM and GR but more fundamentally, we don’t know what gravity and spacetime fundametally is. It is pretty obvious (at least to my lame, amateur mind) that what we define as gravity is just a „leak” of something more fundamental, maybe time and the concepts of beginning/before/after are a part of something larger too on the cosmic scales. One thing we can be sure of, our gut is a bad adviser due to our evolutionary handicap of living is our small Earth bubble. There hasnt been a revolution in my lifetime in physics, I hope the next ~30 years will erect one so I can witness it
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  2. "a mechanical or electrical device for measuring time, indicating hours, minutes, and sometimes seconds, typically by hands on a round dial or by displayed figures."
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  3. A clock measures time by definition. We are in a science section, so let's not wander off on a whimsy.
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  5. I answer the OP's question, only to get a downvote. Not that I care a lot. But seriously, in a forum is it really supposed to be better rewarded not to answer questions? Possibly not as familiar as you are. But the transfer principle immediately allows me to ascertain that the limit p in (2) is identically equal to 0. I did not say that (2) does not make sense. What I said was that it only makes sense if p is 0.
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