NASA’s Jet Propulsion Laboratory recruited ham radio operators across the world to send a coordinated message that could be picked up by Juno. Timing and organization were essential. As you can see in the video below, they were successful. At the right moment, the ham radio operators sent out a simple Morse code message: “Hi”. Juno’s sensors picked it up.
Now Juno can continue its mission and deliver LEGO minifigs to Jupiter.
-Thanks, David Israel!