EarthEarth has a mysterious triple symmetry that may influence its climate A circle running along the 27° east and 153° west meridians divides the globe into two halves with equal reflectivity – and this may have implications for solar geoengineering schemes News
TechnologyTiny 'metajets' could use light to steer sails for interstellar travel Minuscule silicon wafers propelled by lasers could be used to steer light sails, helping them travel beyond the solar system News