The latest SpaceX Dragon resupply spacecraft is now on its way to the International Space Station with more than 6,400 pounds of science investigations and a shiny new airlock! Be sure to tune in to NASA TV tomorrow, Monday, Dec. 7 for live coverage beginning at 11:30 a.m. EST: https://go.nasa.gov/3qyvM8Q | NASA - National Aeronautics and Space Administration

Airlocks play an important role in spacewalks. It is used by Astronauts to move in and out of the spacecraft. This special chamber acts as a buffer zone, maintaining the internal pressure of the spacecraft while allowing safe passage into the contrasting environment of space. The world's first space airlock was a disposable type equipped on the Voskhod 2, launched in March 1965. #WeBelieveInAstronauts #NationalAstronautDay #Astronauts #Trailblazers #Icons #Heroes | National Astronaut Day