| Answer | Crossword Clue |
|---|---|
| PROTON | An object of Bohr's research |
| ATOM | Subject of Bohr's research |
| SUN | Object of Mt. Wilson research. |
| Answer | Crossword Clue |
|---|---|
| PROTON | An object of Bohr's research |
| ATOM | Subject of Bohr's research |
| SUN | Object of Mt. Wilson research. |
Crossword
a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.