| Answer | Crossword Clue |
|---|---|
| OGO | Sky observatory: Abbr. |
| ASTR | Observatory observer: Abbr. |
| NAV | Kind of observatory: Abbr. |
| UFO | Sky sighting: Abbr. |
| UFOS | Sky sightings: Abbr. |
| HOR | Earth-sky boundary: Abbr. |
| UFOS | Strange sky sightings: Abbr. |
| HOR | Where earth meets sky: Abbr. |
| SAC | U. S. sky patrol unit: Abbr. |
| SSTS | Erstwhile big boomers in the sky (abbr.) |
| HOR | Where the land meets the sky: Abbr. |
