Interstellar Spacecraft Voyager 1

[alan123hk]

The interstellar spacecraft Voyager 1 was launched in 1977 and left the solar system to reach the endless interstellar space in 2012. It is now 2021. Voyager 1 has been sailing in space for 44 years. Why does it still have energy to send electromagnetic signals back to the earth? What does this ‘humming’ beyond our solar system mean? Could it be related to aliens, or at least means that future manned interstellar spacecraft will encounter greater risks when they leave the solar system and fly into interstellar space?

https://Earth'sky.org/space/voyager-1-droning-hum-plasma-interstellar-space/
https://www.nasa.gov/feature/goddar...ace-its-density-measurements-are-making-waves

 

[Tom.G]

Why does it still have energy to send electromagnetic signals back to the earth?

Try:
https://www.google.com/search?&q=voyager+1+power+source
The answer is in the very first line of the results.

 

[alan123hk]

Thanks for the very useful information, which means that the three radioisotope thermoelectric generators can only continue to operate for about four years, after which Voyager 1 will no longer be able to send the information back to the earth.

But I believe that inertial motion and universal gravitation will push Voyager 1 to continue to sail into the endless space, and maybe one day it will be discovered by aliens.