NASA’s Deep Space Network keeps track of a large number of probes out there. Spacecraft are at the moon, Mars, Saturn and in deep space. I love the fact that they check in on Voyager 1 and 2 from time to time. Voyager 2 is 31 light hours from earth. Voyager 1 is in interstellar space and 38 light hours out.

You can see how far out they are here.