Credit: NASA Expedition 20 crew / Public domain / Wikimedia Commons In the remote archipelago of the Lesser Sunda Islands (Indonesia), Mount Tambora, an imposing stratovolcano that before 1815 reached ...

The sky was dimmed, even darkened, for months after the eruption ... and volcanic purple light at twilight, were also seen around the world. Sixty-eight years earlier, when Mount Tambora (also ...