Stable Black Hole

The stable black hole was thought up by MCE, when CrazyGuy and him where talking about kinds of trash cans to put in Minecraft. If you touch it, it will hurt you. You can not actually mine it and have it in your inventory, but you can have it in your world.

Black Hole Generator
The only way to even see the block is to make the Black Hole Generator and make that generate the black hole. You can not pick up the black hole and put it in your inventory.

All you do is put some Dark Matter into the generator, then give it some redstone power. It will "charge" up and a black hole will spawn above the generator. The block above the generator has to be air, or it will got spawn until you remove the block above the generator.

Usage
None really, except for an expensive fancy trash can.

Trivia

 * It had no texture at all for a long time. When a texture was added, it was just solid black.
 * You can not mine the black hole and obtain it, the only way to see it is to use the black hole generator.