>Cover asteroid or dwarf planet in something that slows down light
>The speed of light is now below it's escape velocity
>....
>Black hole
https://en.wikipedia.org/wiki/Slow_light
https://en.wikipedia.org/wiki/Micro_black_hole
>The speed of light is now below it's escape velocity
>....
>Black hole
https://en.wikipedia.org/wiki/Slow_light
https://en.wikipedia.org/wiki/Micro_black_hole