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.
حِينَ نَشَرَ أَلْبِرْت آينْشْتَايْن نَظَرِيَّةَ ٱلنِّسْبِيَّةِ ٱلْخَاصَّةِ عَامَ ١٩٠٥ ،‏ كَانَ يَعْتَقِدُ هُوَ وَعُلَمَاءُ كُثُرٌ أَنَّ ٱلْكَوْنَ يَتَأَلَّفُ مِنْ مَجَرَّةٍ وَاحِدَةٍ لَا غَيْرُ ،‏ مَجَرَّتِنَا دَرْبِ ٱلتَّبَّانَةِ .‏