| Answer | Crossword Clue |
|---|---|
| GLENN | First American to orbit Earth |
| GLENN | First American to orbit the Earth |
| JOHNGLENN | The first American to orbit the Earth |
| GLENN | John who was the first American to orbit the earth |
| GAGARIN | First Russian to orbit Earth |
| LAIKA | First dog to orbit Earth |
| ENOS | First chimp to orbit Earth |
| GAGARIN | First human to orbit the Earth |
| GAGARIN | Yuri who was the first to orbit Earth |
| SKYLAB | First mission to put an American space station in orbit |
