“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?

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 ...