Title text:
Lander, this is Houston. There’s been a request that you turn clipping back on and instead set the mass to 1kg. The theorists believe that will be pretty funny.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3294/
Hopefully, they sent a professional coder up there whom they had to train very intensely over a short period to be ready for space flight.