english: He said, imagine that we received a message from an alien civilization, which read: "People of Earth, we will arrive on your planet in 50 years.
non_english: Povedal, predstavte si, že dostaneme  správu od mimozemskej civilizácie, v ktorej bude: "Pozemšťania, za 50 rokov dorazíme na vašu planétu.