June 11, 2025

SpaceX will launch four astronauts to the International Space Station (ISS) on the private Ax-4 mission Wednesday morning (June 11), and you can watch the action live. Ax-4 is scheduled to lift off atop a Falcon 9 rocket from NASA’s Kennedy Space Center in Florida on Wednesday at 8:00 a.m. EDT (1200 GMT). That’s a […]

On June 10, 1854, Georg Friedrich Bernhard Riemann gave his classic lecture on curved space. Riemann was a 19th century mathematician from Germany. His landmark lecture included a workable definition of how someone might measure the curvature of space. In the first part of his talk, Riemann asked the question of how we might define