| Answer | Crossword Clue |
|---|---|
| PARSEC | Interstellar space measurement |
| NEBULAE | Interstellar space clouds |
| DUST | Cosmic ... from interstellar space. |
| PARSEC | Measure for interstellar space. |
| PARSECS | Measures for interstellar space. |
| OORT | .. cloud: comet-filled region in interstellar space |
| PARSEC | Unit of interstellar space: 19.2 trillion miles. |
