Enlarge / The site of the X-ray source in the Whirlpool Galaxy. (credit: NASA/CXC/SAO/R. DiStefano, et al.; Optical: NASA/ESA/STScI/Grendler ) It’s become clear that the Milky Way is full of planets. And the Milky Way is unremarkable compared to many other galaxies, which, in all likelihood, are also rich with exoplanets. But there’s a big […]