tag:blogger.com,1999:blog-7315236707728759521.post8406030562041808257..comments2024-03-27T22:28:06.861-06:00Comments on Dispatches From Turtle Island: Do We See The Expansion Of The Universe In Titan's Orbit?Andrew Oh-Willekehttp://www.blogger.com/profile/02537151821869153861noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-7315236707728759521.post-39659626824650836362022-01-26T00:17:27.751-07:002022-01-26T00:17:27.751-07:00I recently read a paper bounding changes in Newton...I recently read a paper bounding changes in Newton's constant to about plus or minus one part per 4*10^-14 per year (about one part per 10,000 extrapolated to the age of the universe), at the current time based upon observations of the Sun. https://arxiv.org/abs/2201.09804<br /><br />While there is no good reason to think that a changing Newton's constant would change linearly (a power law that is a function of mass-energy density would be much more plausible), there is also no good reason to think that it would be significantly different from linear in the history of the solar system since the drop from extremely high energy densities to those comparable to modern levels would have been heavily front loaded in a FLRW universe. See https://en.wikipedia.org/wiki/Friedman-Lemaître-Robertson-Walker_metricandrewhttps://www.blogger.com/profile/08172964121659914379noreply@blogger.comtag:blogger.com,1999:blog-7315236707728759521.post-15590368841202174032022-01-20T15:31:12.627-07:002022-01-20T15:31:12.627-07:00Is there a back of the envelope calculation for th...Is there a back of the envelope calculation for the Earth lunar distance increase of ca. ~7 cm/annum, a consequence of tidal drag.<br /><br />The Moon was much closer in Silurian times with a diurnal cycle equivalent to ~ 470 days per year. The timescales are ca. 10^17 seconds for cosmic age and expansion to a current terrestrial order 10^7 seconds (1 year).<br /><br /> 100 years ago there was no distance discrepancies noted for pleochroic isotope disntigration radial damage in Precambrian granites ca. 3.5 X 10^9 year than far more recent Tertiary granites. The serious question then raised was whether there was any evidence for changes in the fundemental constants such the fine structure constanr and big G.Graham Dungworthhttps://www.blogger.com/profile/18355209024912564624noreply@blogger.comtag:blogger.com,1999:blog-7315236707728759521.post-14449389420828663172022-01-20T14:25:41.601-07:002022-01-20T14:25:41.601-07:00This seems like a stretch. Inner moons should be p...This seems like a stretch. Inner moons <i>should</i> be perturbing Titan into a high orbit. That's just how orbital mechanics work.Ryanhttps://www.blogger.com/profile/07906194112935320590noreply@blogger.com