What is Karman line?

 

       The Kármán line is an imaginary boundary that marks the end of Earth's atmosphere and the beginning of space. It is named after Theodore von Kármán, a Hungarian-American mathematician and aerospace engineer who first proposed the concept in the early 20th century.

           The exact height of the Kármán line is somewhat arbitrary and has been the subject of some debate among scientists and policymakers. However, the most commonly accepted definition places the line at an altitude of 100 kilometers (62 miles) above sea level.

            The Kármán line is important because it is often used as a threshold for defining the boundary between Earth's atmosphere and outer space. It is also used as a criterion for determining whether an aircraft or spacecraft has achieved spaceflight, since vehicles that fly above the Kármán line are technically in space.

While the Kármán line is not an official legal boundary, it has been widely recognized by international organizations and is used by many countries as a guideline for space-related activities. For example, the United States Federal Aviation Administration considers anyone who has flown above the Kármán line to be an astronaut.