Near the galactic core, you find a beacon indicating that an ancient civilization hid one of their worlds within a nearby black hole[1]. Is this what passes for intergalactic humor, or is there actually something in there?

The disk image can be found on the shell machines at /problems/blackhole.img and the contents of the image are available in /problems/blackhole/
Hint: ls -b will help you get past the first hurdle. Good luck and godspeed. 

[1]https://2013.picoctf.com/problems/blackhole.img