Jack Applin submitted this B.C. strip as a CIDU, noting that “Grog hit the ball to … Saturn? Let’s ignore the [80 minute] light speed delay [one way!]. What is that film around the planet and rings? Atmosphere? But Saturn is a GAS GIANT — all that we see is atmosphere inside the rings!“

The obvious astronomical destination would have been a black hole, but that would have been impossible to convey to readers, and the closest known black hole is 1500 light years away.
My guess is that Mason chose Saturn because it is the only planet that could possibly be recognized in comic strip resolution. Most papers that still print daily comics do so in monochrome, which could seriously deteriorate the carefully shaded images in the first three panels.
P.S. Just a week later, a very similar gag appeared in The Wizard of Id:

Both strips have a long history of using golf gags, but a little more temporal separation between these two might have been advisable.













