A 50-strong fleet of hot air balloons journeyed over the Dover Strait - one of the busiest waterways in the world - within four hours after setting off at about 7am.

Weather balloons and research balloons typically fly to altitudes of more than 100,000 feet (30,480 meters), well above where commercial aircraft typically fly, according to NASA and the National ...

Meteorologists launch high-altitude balloons from the United States dozens of times each day.What’s more, weather balloons are deployed twice a day, every day, at the same time from almost 900 ...