Human and robot shook hands in outer space for the first time Wednesday.
The robot's hand appeared to droop a bit, but Burbank reached down to grab it, and the two proceeded to shake.
For the record it was a firm handshake, Burbank said. Very nice. Nice job on the programming and all the engineering. Quite an impressive robot.
Robonaut also signed Hello, world in American Sign Language, Space.com reported.
Robonaut has his own Twitter account, @AstroRobonaut, and more than 53,000 followers.
The following tweet was posted on Wednesday: The handshake was definitely one of the highlights of the day, but I'm not done yet! I've still got some really fun stuff coming up!
Major props were also given on Twitter to Robonaut's creators: Seconding the congratulations from my commander to my Robonaut team on the ground. They do great work (though I might be biased...).
Check out the historic handshake below. Hopefully Robonaut will not take a turn for the worse and follow the path of HAL 9000 or any other evil space robots and stick to helping crew members.