+Galaxies are immense systems of [Stars](/wiki/Stars), gas, dust, and [Dark Matter](/wiki/Dark_Matter), held together by gravity. These cosmic islands, from swirling spirals to tranquil ellipticals, populate the vast [Universe](/wiki/Universe).
+## See also
+- [Milky Way](/wiki/Milky_Way)
+- [Cosmology](/wiki/Cosmology)
+- [Black Holes](/wiki/Black_Holes)