Charles Shults shares two images from his new book, The Living Galaxy: The first depicts 'Roche Worlds'-- double planets so close together that they deform each other through gravity into egg shapes. "We have already found double asteroids in space, and we could find double worlds soon," he writes.
The second image portrays a world near an exotic magnetar star. "Salt water in the oceans might sprout spikes from the powerful magnetic fields," Shults explains.