High altitude balloons are Balloon s, usually filled with Helium , that are released into the upper atmosphere, generally reaching between 60,000 and 120,000 Feet .
The most common type of high altitude balloon are Weather Balloon s, although there are many other purposes to which such balloons can be put. Many scientific groups and universities use them to conduct experiments in the upper atmosphere, and modern balloons generally contain electronic equipment such as Radio Transmitter s, Camera s, and sometimes a Satellite Navigation System , such as GPS .
These balloons are launched into what is termed " Near Space " - the area of Earth's Atmosphere where there is very little air, but which is not high enough to be in the realm of Satellite s.
