“The moon comes between us and the sun, and it’s exactly ... The WB-57 plane can fly at an altitude of 60,000 feet, well above any clouds and high enough that Earth’s atmosphere won ...

Scientists planned to send a high-altitude helium balloon into the stratosphere where it would release fine particulate matter into the atmosphere—thereby cooling the Earth. Got a tip?

Skywatchers in central Florida and southern Texas can witness a rare lunar standstill on Feb. 7, as the waxing gibbous moon ...

Traveling at high altitude can be hazardous. The information provided here is designed for educational use only and is not a substitute for specific training or experience. Princeton University and ...

sun halos are formed when the light around the sun hits cirrus clouds, high-altitude formations made of ice crystals. Sun halos can be seen mostly during the day, and more often in winter.