High-altitude

The Tibetan plateau is known as the world’s Third Pole because of the amount of ice that is locked in its high-altitude wilderness.

My family spent vacations around Baguio City, a high-altitude place where strawberries and blueberries thrived, unlike in the lowlands of tropical Philippines.

The team's goal is to eventually fly the single-propeller aircraft studded with 22 square meters of solar panels into the stratosphere. In 2022, the team hopes to carry out a high-altitude flight powered exclusively by solar energy, seeking to reach the stratosphere at an altitude of 20,000 meters.

Another concept, this one from Virginia-based Raytheon BBN Technologies, would use a balloon-lofted, high-altitude air gun to change the course of potentially dangerous orbital junk, such as inoperative satellites.