11 Wildly Inaccurate Movie Science Tropes

Look up to the sky on pretty much any alien planet and you'll probably see at least one enormous, looming moon taking up about half of it. You might even be able to pick out features, rings or the odd moon-mining colony.

It makes our little, thumbnail-sized moon look positively boring.

The inhabitants of these lunar-dominated planets, however, almost always fail to acknowledge the effects of having such a large gravitational object so close to their planet. 

They never even mention the enormous tidal flooding that would destroy everything in its path, forcing them to either constantly rebuild, or somehow live above the flood level. They are similarly silent on the subject of the regular, devastating earthquakes and the constantly erupting volcanoes caused by the moon's effect on the planet's geology. 

Nobody even bats an eyelid at the lengthy eclipses that would plunge the world into darkness on a regular basis, or even the fact that their weight would fluctuate wildly as the moon's gravity pulls them towards its surface.

Not to mention the fact that, if the planet is anything like the Earth (and as we have already established, they almost always are) it's own gravity would rip the moon apart, reducing it to rubble arranged in Saturn-like rings. Which would, admittedly, look just as cool.