One of the coolest science trips I made with my son, years ago, was to the Goldstone Deep Space complex in California.

We got treated to an incredibly indepth tour of the facility - including looking into the ruby maser equipment that amplifies the infinitesimally minuscule signal from voyager.

Truly one of the crowning achievements of the 20th century is to have successfully sent these two objects into deep space and keep in contact with them for over four decades!!