Trekked through loud stores on #BlackFriday? Take a break from carols and learn about this chorus of black holes singing in x-rays instead: http://go.nasa.gov/2i3aXUr #BlackHoleFriday
Trekked through loud stores on #BlackFriday? Take a break from carols and learn about this chorus of black holes singing in x-rays instead: http://go.nasa.gov/2i3aXUr #BlackHoleFriday
