Cosmic viewer The Atacama Cosmology Telescope in Chile was used by the team to observe gravitational interactions between galaxy clusters.(Courtesy: M Devlin/University of Pennsylvania/CC BY-SA 4.0)"> Cosmic viewer The Atacama Cosmology Telescope in Chile was used by the team to observe gravitational interactions between galaxy clusters.(Courtesy: M Devlin/University of Pennsylvania/CC BY-SA 4.0) Newton’s and Einstein’s theories of gravity apply across distances of hundreds of millions of light–years. That is the conclusion of an international team of scientists, whose measurements of the gravitational acceleration of galaxy clusters have been made over the largest distances ever studied. The study supports the Standard Model of cosmology, which invokes the gravitational effect of dark matter to explain the large-scale structure of the universe. As a result the team claims that its observation is at odds with alternative theories of gravity such as modified Newtonian dynamics (MOND).…