The best example is represented by the Sunflower galaxy (Messier 63 / NGC 5055) with the strongest external field among SPARC galaxies, whose well-measured rotation curve shows a mildly declining behavior at large radial distance and can be accurately modeled only with an external field effect. Credit: ESA/Hubble & NASA ================================================================= Team of international collaborators detect ‘external field effect,’ a prediction unique to MOND, rival dark matter hypothesis. An international group of scientists, including Case Western Reserve University Astronomy Chair Stacy McGaugh, has published research contending that a rival idea to the popular dark matter hypothesis more accurately predicts a...