Week’s Best Space Pictures: Pluto’s Possible Ice Volcano

Saturn’s moons size each other up, and a messy galaxy shines a mysterious X-ray beacon.

Feed your need for heavenly views of the universe with our pick of the most awe-inspiring space pictures. This week, tangled lines of glowing particles cover the sun’s surface, Pluto shows off its many-layered atmosphere, and one of the Milky Way’s brightest star clusters glitters.