About:

• The most widely accepted boundary of space is known as the Kármán line, 100km above mean sea level. But the United States uses 80km as the cutoff point. Branson’s Virgin Galactic flight reached a height of 86km while Jeff Bezos’ Blue Origin flight is expected to go about 106km high.
  
  
• The Kármán line has been compared to international waters, as there are no national boundaries and human laws in force beyond the line. Above this level, there would be free space.
  
  
• It was named after aerospace pioneer Theodore von Kármán
  
  

Why do we need a Kármán line?

• The 1967 Outer Space Treaty says that space should be accessible to all countries and can be freely and scientifically investigated.
  
  
• Defining a legal boundary of what and where space is can help avoid disputes and keep track of space activities and human space travel.