"Gravity3D simulates the gravitational interaction between galaxies as they collide. It uses the gravity equation F=G*M1*M2/R^2 and assumes that orbiting stars have negligible mass compared to the parent stars/black holes."

"The idea is that Hawking radiation is not random but contains subtle information on the matter that fell in,"

"However, within a few years we should know whether we can believe that we live in a universe that is completely self-contained and without beginning or end."

"The gravitational field, as reconstructed from lensing observations, is not pointing toward the ordinary matter. That’s exactly what you’d expect if you believed in dark matter, but makes no sense from the perspective of modified gravity."