The most successful space mission in history, Voyager left our solar system. Those two probes are outside heliopause. The most out position of our solar system. Heliopause means the point where ions flow from the Sun mixes with ions that are coming from other stars. That spacecraft gave multiple wonderful images to the researcher. It found many strange things. And the last thing that this spacecraft found was the cosmic hum. NASA plans to keep in contact or analyze the data that those probes sent for as long as possible. The lifespan of those probes will extend by shutting down the systems. And somewhere in the 2030s, all systems of those probes end their operations. But long before that the helium storage of the gas rockets ends and two-way communication between probes and Earth turns impossible or meaningless. The information sent from Earth includes orders to change the posture of the probe. And another thing is how to use the instruments. So when Voyager probes left from...