| Answer | Crossword Clue |
|---|---|
| PROXIMACENTAURI | Second-closest star to Earth |
| PERIGEE | Orbital point closest to earth |
| TITOV | Russian Gherman who became the second person to orbit the Earth |
| TITOV | Gherman ..., cosmonaut who was the second human to orbit the earth |
| PROXIMA | ... Centauri (closest star to the sun) |
| ALPHACENTAURI | Star system closest to the sun |
| ALPHACENTAURI | Closest star system to the solar system |
| ALPHACENTAURI | Star system closest to the solar system |
