The Voyager 1 spacecraft launched in 1977 is now over 15 billion miles from Earth, and a radio signal from NASA takes more than 22 hours to reach it, meaning every command is really an instruction for where the probe will be by tomorrow (opens in new tab)

Voyager 1 is now over 15 billion miles from Earth, and a radio command sent from NASA takes more than 22 hours to reach it. Every instruction is really aimed at where the spacecraft will be by tomorrow.