I assume you mean "black holes". Yes, it is now considered quite certain that they do, indeed, exist. Please note that the properties of black holes in Science Fiction are often quite different than those of real black holes - basically, whatever suits the author's plot.
6 wholes and 1 fifth or 6 wholes and 2 tenths.6 wholes and 1 fifth or 6 wholes and 2 tenths.6 wholes and 1 fifth or 6 wholes and 2 tenths.6 wholes and 1 fifth or 6 wholes and 2 tenths.
.75
Ten fifths make two wholes.
6 wholes and 7/12
There are 16 halves in eight wholes.
There are 21 thirds in 7 wholes.
You can make 3 wholes
Space is not black, space is transparent.
There are twelve thirds in four wholes.
23 of 4 wholes = 92.
There are: 15/3 = 5 wholes
8.66-3.86=4.8=4 wholes and 17 over 21