Flying over Planet Earth . ... Credit Copyright: NASA ; Acknowledgement: Infinity Imagined Explanation: Have you ever dreamed of flying high above the Earth? Astronauts visiting the International Space Station do this every day, circling our restless planet twice every three hours. ... Many wonders whiz by below, including vast banks of white clouds, large stretches of deep blue sea, land lit up by the lights of big cities and small towns, and storm clouds flashing with lightning . ...