Another example of science fiction eventually becoming fact. In 1933 (1933)!! Two SF authors predicted the use of a mag lev rail gun for space launches! The book was made into a movie in 1951. Here is the mag-lev launch scene from the move, extraordinarily impressive special effects for the time!!https://www.youtube.com/watch?v=Kgc8wt_zC3o
The story is about a rouge gas giant planet (also unknown to exist at the time) on a collision course with Earth to destroy it in about a year. Americans scramble to build a giant space ark with 1933 technology which will transport 40 people to the Earth-sized moon of the rogue planet.
Now decades later this movie got a lot of flack because there were no Niggers, Africans, Mexicans, etc. on board the space ark the white people built. I say they were SMART!!
Actually, the book differs in a few ways from the movie, in the book, other nations besides the USA built their own space arks; France, China, Germany, nearly a dozen others, although some of these were not completed in time and others failed after launch and crashed back to Earth, a few made it.
I encourage everyone to find the original novel online and read it, they don't write 'em like this anymore!