| Answer | Crossword Clue |
|---|---|
| YERKES | Observatory at U. of Chicago. |
| YERKES | Observatory at Chicago U. |
| WILLIAMSCOLLEGE | Site of the oldest U.S. observatory |
| YERKES | U.S. observatory. |
| PALOMAR | U.S. observatory |
| OGO | U.S. space observatory |
| VPS | U.S. Naval Observatory residents |
