Black Holes
| Y | X | Y | E | S | P | A | L | L | O | C | T | C | K |
| M | T | N | T | C | K | Q | I | R | A | I | Q | S | E |
| S | I | I | H | I | Y | Z | A | J | M | O | I | I | V |
| P | U | B | C | R | R | L | S | E | E | D | N | P | E |
| R | I | P | A | O | L | A | D | T | N | J | T | O | N |
| A | W | T | E | E | L | I | L | O | I | B | R | G | T |
| W | T | D | T | R | L | E | I | U | E | N | R | A | H |
| J | S | S | E | A | M | T | V | T | G | A | S | O | O |
| L | F | D | T | N | E | A | O | E | V | N | G | S | R |
| O | H | I | V | R | S | N | S | I | P | T | I | K | I |
| N | O | H | C | R | A | E | T | S | H | A | X | S | Z |
| N | E | C | G | E | O | Y | P | E | I | A | C | D | O |
| U | A | R | A | S | A | U | Q | I | L | V | S | S | N |
| A | E | S | P | A | G | H | E | T | T | I | E | Z | E |
- ACCRETIONDISK
- COLLAPSE
- DENSE
- ESCAPEVELOCITY
- EVENTHORIZON
- GRAVITY
- JET
- QUASAR
- SINGULARITY
- SPAGHETTI
- STELLAR
- SUPERMASSIVE
- TIMEDILATION
- WARP
The strangest objects in the universe, where gravity gets so intense that not even light escapes. This grid packs in the real vocabulary, from the event horizon and singularity to spaghettification and time dilation. It suits older students and space geeks who want a challenge. Play it in your browser, or print it and puzzle it out with a coffee.