Science, Maths & Technology
How the atmosphere sustains life on Earth
...research balloons are built to be able to fly in the stratosphere in the thin air. Most of the sky would already be dark, rather than blue, for a passenger in such an aircraft. The top of the stratosphere lies at about 50 km altitude. Although there are more rarefied atmospheric layers above, for practical purposes the environment is already much more like ‘space’ by...