'J': The Operational Land Imager on Landsat 8 captured this image of the Trunk Reef near Townsville, Australia (left). 'K': The Operational Land Imager (OLI) on Landsat 8 acquired this image of glaciers at the Sirmilik National Park Pond Inlet in Mittimatalik, Canada (right). Letters were found in river systems, phytoplankton blooms, ocean reefs, and other dazzling natural phenomenons