A helmeted robot lands a flying saucer in a park in Washington, D.C. Dinosaurs freely roam a small isle off of Costa Rica. The Mayan calendar accurately predicts the fiery end of the world. Are the plots of sci-fi movies really that far-fetched?

Of course they are. But NASA, whose space engineers are apparently also sci-fi movie buffs, has compiled a list of the most — and least — realistic science fiction films of all time.

They saved a particular amount of ire for the Roland Emmerich's end-of-days epic 2012, which they deemed the least realistic. Rounding out the list are other apocalypse flicks The Core and Armageddon.

The most believable? Gattaca, a 1997 love story set in a dystopian future. Steven Spielberg's Jurassic Park and 1951's classic  alien invasion film The Day the Earth Stood Still also make the grade.