At first, it looked like a faint wisp of cloud stretched across the dark sky. But something about the arc’s pale glow felt unusual. I reached for my camera, adjusted the settings for a long exposure, and there it was: a moonbow. Unlike its vibrant, sunlit cousin, a moonbow, or lunar rainbow, is a rare…
The Gruta do Carvão, a basaltic lava tube carved by molten rivers of magma, lies hidden beneath the western edge of Ponta Delgada on São Miguel Island in the Azores. Formed approximately 12,000 years ago when lava from the Serra Gorda flows reached the ocean and drained, it now stretches some 1,650 meters underground, though…
