timmdeeg's latest activity
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TWith a radially oriented uniform rod of length 2L with its geometric center ##r_c## from the center of a massive object, integrating...
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Ttimmdeeg replied to the thread High School Long rod in orbit.So it doesn't matter that the tidal forces aren't symmetric along the rod? They are increasing downwards. To exaggerate it, imagine an...
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Ttimmdeeg replied to the thread High School Long rod in orbit.A question aside. Tidal forces would try to stretchen the rod. So there should be one point on the rod where these forces cancel each...
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TA rod would try to orient itself radially, due to tidal forces, in the same way as tidally-deformed ellipsoids of planets and moons...
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Ttimmdeeg reacted to Andy Resnick's post in the thread Our Beautiful Universe - Photos and Videos with
Like.
Final image, ready for printing, of the Virgo Cluster. The image area is approximately 14 degrees on a side: At 1:1, it looks like... -
Ttimmdeeg reacted to mitchell porter's post in the thread Undergrad MOND disproved at large scales with
Informative.
It's standard MOND lore that MOND doesn't quite work for galaxy clusters - it has its own "missing mass" problem, or need for dark... -
Ttimmdeeg replied to the thread Undergrad MOND disproved at large scales.So is MOND a theoretical framework which makes predictions? If yes, should this framework hold scale independent? In other words would...
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Thttps://arxiv.org/pdf/2604.14327 Fig.1 and Fig.2 seem to show that MOND is disproved at large scales due to measurements of galaxy...
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Ttimmdeeg replied to the thread High School Do Dark Energy and the Casimir effect indicate Exotic Matter could exist?.See also Jaffe 2005 https://arxiv.org/pdf/hep-th/0503158 The Casimir force is simply the (relativistic, retarded) van der Waals force...
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Ttimmdeeg reacted to Andy Resnick's post in the thread Our Beautiful Universe - Photos and Videos with Like.
Clear nights have been scarce lately, but tonight I was able to image Jupiter and the Galilean moons: This is a 200% crop from a...
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Ttimmdeeg replied to the thread Undergrad Are Alternative Dark Energy Models Treated More Favorably Than MOND?.https://arxiv.org/pdf/2412.15143 We compare the standard homogeneous cosmological model, i.e., spatially flat ΛCDM, and the timescape...
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Ttimmdeeg replied to the thread Undergrad Help Understanding the Hubble Constant's Units.That's just natural, nothing paradox or unexpected.
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Ttimmdeeg reacted to sophiecentaur's post in the thread Undergrad Help Understanding the Hubble Constant's Units with Like.
You could say the same about any measurement unit. We rely on past calibrations and our graphs etc. to give the distance from a given...
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Ttimmdeeg replied to the thread Undergrad Help Understanding the Hubble Constant's Units.If we talk about cosmological distances, aren't these spacelike? So, we would need the knowledge of the expansion history to know them...
