system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do we keep in contact with spacecraft such as Voyager 2 that are at the very edge of our solar system?
gpt
With very big dishes on Earth, and very sensitive receivers that can find the tiny signal.

Fun fact: the Voyagers' radio transmitters are 20 Watt -- which is the same power as the bulb in your refrigerator.

So we're effectively looking for a flickering fridge bulb, 19 billion kilometres away...