Science

I find it stressful enough doing an update on a remote server (where there's someone in support who can reboot the box if it all goes wrong). It's got to be something else to send commands to a spacecraft that's now light hours away. It's not just that you can't exactly go out and troubleshoot the hardware, it's also that the ping time is rather extreme so you won't know for hours if you've screwed up or not!