... A Dark Earth with a Red Sprite . ... Colorful Clouds Near Rho Ophiuchi . ... What's that on the horizon? ... Its close conjunction with the Moon on August 13 was appreciated around planet Earth. ... During the past week, nightfall on planet Earth has featured Mars, Saturn, and Spica in a lovely conjunction near the western horizon. ... From about 80 kilometers above Earth's surface, the icy clouds can still reflect sunlight even though the Sun itself is below the horizon as seen from the ground. ...