Astronauts are taking the 200th spacewalk of all time for the ISS. Astronauts Peggy Whitson and Jack Fischer will float outside the space station to install technology.
The first spacewalk outside the ISS took place on December 7, 1998.
They are setting up a new HD camera and replacing old hardware.
The International Space Station Is used by many different nations. Many different projects take place there, including scientific research and spacecraft construction.