The rocket was beautiful. In conception it had been shaped by an artist to break a chain that had bound the human race ever since we first gained consciousness of earth's gravity and all it's analogs in suffering, failure and pain. It was at once a prayer sent heavenward and the answer to that prayer: Bear me away from this awful place.
If there’s a zeppelin, it’s alternate history. If there’s a rocketship, it’s science fiction. If there are swords and/or horses, it’s fantasy. A book with swords and horses in it can be turned into science fiction by adding a rocketship to the mix. If a book has a rocketship in it, the only thing that can turn it back into fantasy is the Holy Grail.