Thanks to Palomar Skies reader George S. for pointing out to me that the Palomar Observatory was featured in Rocketship X-M, a SciFi movie from 1950. The movie stars a very young looking Lloyd Bridges as one of the pilot of the rocket. Hugh O'Brian who plays Harry Chamberlain - an astronomer of the Mt. Wilson and Palomar Observatories.
In the film a crew of five takes off on the first voyage into space with the Moon as their destination. Somehow they end up off course and make it to Mars. Curiously enough as the rocketship decends to Mars the landscape does bear a resemlance to the real Red Planet. Craters and a dry riverbed can be seen.
Of course any hint of the real Mars is blown away as the intrepid explorers are greeted by a thunderstorm as they touchdown on the Martian surface.
Here is a video clip of the Palomar 200-inch telescope in Rocketship X-M.