An area where radio signals and any type of communications cannot be received.
Once upon a time in 1970, a military training rocket went off course and accidentally invaded Mexican airspace. Somehow landing hundreds of miles off-course, the rocket buried itself in the desert region of Durango, Mexico.
The first sounding rocket was launched on February 16, 1949
When scientists use the term “sound” in relation to the upper atmosphere, they are referring to a process of using instruments carried by rockets to gather data about the properties of the atmosphere at different altitudes. This process is known as “sounding”, and it involves measuring various physical properties of the atmosphere, such as temperature, pressure, and composition, at different heights.
