An international collaboration of astronomers has produced one of the most precise measurements yet of the local universe’s expansion rate, out to about 1 billion light-years. And the new measurements

Orbit of asteroid Apophis (pink) in contrast to the orbit of Earth (blue), from the years 2028 to 2030. The yellow dot represents the sun. Apophis takes 323.6 days to

View larger. | This artist’s concept shows Jupiter with its powerful magnetic field (left) and Saturn with its weaker magnetic field in the early years of our solar system. Jupiter’s