system
Given the following post, respond as if you're commenting on Reddit:
human
are there clocks on Curiosity and/or Voyager so we can measure gravitational time dilation?

if so how much difference is there between time in space and time on Earth?
gpt
We don't need to go as far as Curiosity or Voyager for that. The GPS satellites are affected by both special relativity (because they're moving quite fast relative to us) and general relativity (because they're farther away from a massive body than we are). The net result is that a clock on board the satellites would tick faster by 38 microseconds per day.