Scientists at Harvard have built a miniature device that can twist and tune light in real time. By rotating two stacked photonic crystals and adjusting their spacing with a tiny mechanical system, ...

Jessica Meir and Chris Williams spent 7 hours and 2 minutes on EVA today (March 18).

Greek mythology has given a name to a great many objects in our solar system. But perhaps one of the least well understood ...

Every eleven years, the sun's magnetic field flips. Sunspots—dark, cooler regions on the sun's surface that mark intense magnetic activity and often trigger solar eruptions—appear at mid-latitudes and ...