What is it? THE BLACK HOLE.
I was wondering that the mass cant just dissapear into the black hole with all its energy to nowhere. It has to goes somewhere does it? Then my theory is that it converts ordinary mass (Baryonic mass) into dark matter (non baryonic mass). Thats why once the mass goes into the black hole, we cant detect it again because it has been converted.
The black hole since it is black, it paints the matter that goes into it also making it black and undetectable. kinda funny.

__________________
<span style='font-size:14pt;line-height:100%'><span style='color:red'>The</span><span style='color:black'> Black Hole</span><span style='color:red'> and </span> <span style='color:white'>White Hole </span><span style='color:red'>are best friends!</span></span>

We are trapped in space forever!