Pluto and Charon show off two of their sides in pictures taken by the New Horizons spacecraft. Each of the dark spots on Pluto (orange, right) is roughly the size of Missouri.
NASA, JHUAPL, SWRI
MAGNETISM UNVEILED Hot gas in the sun’s atmosphere flows along magnetic field lines (pale streaks) that puncture the surface. Sunspots with opposing magnetic polarity are blue and yellow in this false-color image.
RADIO REFLECTIONS To send messages via the moon, ham radio operators send radio waves some 384,000 kilometers to the Earth’s natural satellite. The waves bounce and hopefully are received by a ham radio user somewhere else.