The International Space Station will soon be getting some new robot occupants. Astrobee is a robotic cube packed with sensors, cameras, computers, and apropulsion system. Its designed tohelp astronauts around the ISS with a variety of tasks.

While the robot is designed to fly freely on board the ISS, for testing on the ground, Astrobee is mounted on top of a sled that uses a jet of CO2 to create a low-friction air bearing above a perfectly flat (and very enormous) block of granite. This allows the researchers to simulate microgravity in two dimensions to test the robots propulsion and navigation systems, but once its up in space, the entire robot will consist of just the cube thats defined by the blue bumpers, without all of the stuff underneath it.

Last fall, IEEE Spectrum visited NASA Ames Research Center in Mountain View, Calif., to have a look at the latest Astrobee prototype and meet the team behind the robot.

NASA expects to have Astrobee on orbit at some point between July 2017 and June 2018. Theyll be sending three of them to the ISS, although they only expect two robots to be active at once: The third will be packed away in a space closet somewhere.

Read More: How NASA's Astrobee Robot Is Bringing Useful Autonomy to the ISS

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Astrobee: NASA's Newest Robot for the International Space Station - IEEE Spectrum