SORU: boş bırakılan yere parçanın anlam bütünlüğünü sağlamak için getirilebilecek cümleyi bulunuz
Astronomers know that nearly every large galaxy
contains an enormous black hole at its centre. The
death of stars can produce small black holes, with
masses ranging from about three to 100 times the
mass of the Sun. However, such black holes are tiny
compared with the giants found at the centres of
galaxies. ---- Why are they so common in galaxies?
Which came first, the galaxy or the hole? And how
did they form in the first place?