The cover image is a vacation poster from the Exoplanet Travel Bureau. The poster and the bureau are fictional but the destination is real. Kepler-186f is the first Earth-sized planet discovered in the “Habitable Zone” around another star, where liquid water oceans could exist on the planet’s surface. Its star is much cooler and hence redder than our Sun. If plant life grows on Kepler-186f, photosynthesis there may have adapted to red “sunshine,” producing a colour palette that’s different from the garden greens of Earth. Kepler 186f is one of thousands of planets discovered in the last three decades. UBC astronomer Jaymie Matthews shares this story of cosmic discovery in his article “Setting sights on alien oceans” on page 12.