Jeff Bezos's Blue Origin passes 4 key milestones for its $172 million NASA contract to build a new space station

• NASA awarded Blue Origin $172 million to develop a space station for both astronauts and tourists.
• The space station, called Orbital Reef, will need to be able to support human life. 
• Recently, Blue Origin passed four milestones in helping prove Orbital Reef is well on its way.

The International Space Station won't be around forever, and NASA is pouring hundreds of millions of dollars into its potential replacements.