この文章を簡単な日本語に訳してください: "In the world of science fiction, a popular concept is the idea of humans being able to travel to other galaxies."
In the world of science fiction, a popular concept is the idea of humans being able to travel to other galaxies.
科幻の世界では、人類が他の銀河へ旅立つことができるという考え方が人気があります。