Every one who dreams about aliens should read your post 10 times. It is the exact reason why no one will visit earth or earth spacecrafts will not reach other planets outside our solar system.
There is that vast dark space between consecutive solar systems. The solar panels have no power source after exiting our solar system for hundreds of thousand year. They will just drift into the vast dark space and get lost in space.
“The solar panels have no power source after exiting our solar system for hundreds of thousand year.”
They are pretty much useless past Jupiter’s orbit. The Juno orbiter had three massive panels and only produced 500 watts.