WHEN Albert Einstein published his special theory of relativity in 1905, he and many other scientists believed that the universe consisted of just one galaxy ​ — our Milky Way.
KETIKA Albert Einstein menerbitkan teori relativitasnya yang istimewa pada 1905, ia dan banyak ilmuwan lain meyakini bahwa alam semesta terdiri dari hanya satu galaksi — Bima Sakti kita.