Startrails Above the Top of the World

The world’s highest peak just became a tiny bit higher. Nepal and China, the two countries that share a border on Mount Everest, has announced a new official measurement of the mountain’s height: 8,848.86 meters, or 29,031.69 feet. This long-exposure timelapse image is from Everest Base Camp, shows the colorful startrails. These celestial arcs reflect the planet’s daily rotation on its axis, resulted from digital stack of 240 sequential （1.5 hours) exposures. The image also reveals star colors. Bluish trails are from stars younger and hotter than our Sun, while yellow orange trails are from cooler older stars.