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" ... But observationally, it failed. It failed to even be as good as the ancient Ptolemaic model with its epicycles, equants and deferents. It was a brilliant idea, and the first attempt to argue — from pure mathematics alone — how the Universe ought to be. But it just didn't work. ... "
" ... From a modern point of view, this makes sense, as any massless form of radiation — whether particle or wave — must travel at exactly the speed of light. What started off as an assumption based on the need for self-consistency in our theories has now been directly confirmed observationally. Newton’s original conception of gravitation doesn’t hold up, as gravity isn’t an instantaneous force after all. Instead, the results agree with Einstein: gravitation propagates at a finite speed, and the speed of gravity is exactly equal to the speed of light. ... "
" ... Illustration of a fast gamma-ray burst, long thought to occur from the merger of neutron stars. The... [+] gas-rich environment surrounding them could delay the arrival of the signal, explaining the observed 1.7 second difference between the arrivals of the gravitational and electromagnetic signatures. This is the best evidence we have, observationally, that the speed of gravity must equal the speed of light: to approximately 1 part in 10^15 (a quadrillion). ... "
" ... It’s kind of unfortunate that we were so quick to give them such an ambitious name like “super-Earth,” because there’s an assumption encoded in that name that they’re somewhat Earth-like. But we have to be very, very careful with that assumption. While it may be a tantalizing possibility to consider that there are plenty of planets out there that are a bit larger than Earth that offer similar conditions to our world, that’s something we have to examine in detail: both observationally and theoretically. ... "
" ... On the largest scales, the way galaxies cluster together observationally (blue and purple) cannot be ... [+] matched by simulations (red) unless dark matter is included. Although there are ways to reproduce this type of structure without specifically including dark matter, such as by adding a specific type of field, those alternatives either look suspiciously indistinguishable to dark matter or fail to reproduce one of the many other observations in support of dark matter. ... "