By 1784 science recognized the universe as being the Milky Way of 8,000 x 1,500 Light Years (LY) By 1906 they decided that it was actually 23,000 x 6,000 LY 1912 the universe size was expanded by scientists to 170,000 LY. By 1920 the dimensions of the galaxy were revised to 55,000 x 11,000 LY. (Now it is assumed to be about 100,000 x 20,000) ( Have you heard of the Andromeda Galaxy? Well, less than a 100 years ago scientists called it the Andromeda Nebula because the "fact" was that it was a gaseous nebula 19 light years from earth. In 1924 it was discovered that the Andromeda Nebula was actually NOT a nebula but another whole galaxy and was at a distance of 750,000 LY. In 1952 the distance was changed again to 2,300,000 LY. Now Google shows it at 2,540,000 LY. ) In the 1950s the furthest galaxies said to be about 1 - 2 billion LY away. Within the next few years ( by mid 1960s) they were said to be 9 billion LY The universe is now thought to be 156 Billion LY Wide!