New research suggests that a troubling disparity in the rate of expansion of the universe, known as the Hubble constant, may arise from the fact Earth sits in a vast underdense region of the cosmos. The issue has come to be known as the “Hubble tension.” It arises from the fact that there are two … Read more
The Hubble Space Telescope has spent more than thirty years providing some of the most incredible images of the known universe, but it’s only for the last ten that scientists have pointed its gaze at our solar system’s outer planets to observe them like never before. For the past decade, NASA’s Outer Planet Atmospheres Legacy … Read more
The term quasar comes from quasi-stellar objects, a name that reflected our uncertainty about their nature. The first quasars were discovered solely because of their radio emissions, with no corresponding visual objects. This is surprising since quasars blaze with the light of trillions of stars. In recent observations, the Hubble examined a historical quasar named … Read more