Many science fiction movies involve scenes set on the surface of alien planets. In many of these scenes we see objects in the sky of the alien planet; sometimes a sun or suns; more often one or more alien moons. These objects are almost always very large compared to any standard of realistic physics.
The earth has a very large moon by known standards. It occupies an angle of about 0.5 degrees in the sky. It is, relative to the earth, the biggest moon in the solar system (and the biggest satellite we know). What we see in the sky on earth is therefore very large for a satellite.
But there are SciFi movies where we see alien skyscpaes with huge moons relative to the visual size of Earth's moon (which is very large).
And this is hardly a new thing. This is from Star Trek TOS:
This is from Total Recall:
This (the one that finally prompted me to ask this question) is from Altered Carbon and is a scene from Harlan's World:
Is there any good reason why SciFi moons are so big? Or is this a case of "I don't care about the laws of physics as long as it looks good on screen"?
Is there any in-universe justification for this common trope?