Across
- 3. - Touchdown of a spacecraft on a celestial body
- 5. - Extravehicular activity performed by an astronaut outside a spacecraft
- 7. - International Space Station, a habitable space station in low Earth orbit
- 10. - Interstellar cloud of dust, hydrogen, helium, and other ionized gases
- 11. - NASA's human spaceflight program that landed astronauts on the Moon
- 12. - Vast system of stars, gas, and dust held together by gravity
- 14. - Russian astronaut
- 19. - Act of traveling through space to discover and learn about new worlds
- 20. - Vehicle designed for travel or operation in outer space
Down
- 1. - Celestial body that orbits a star and is not a moon
- 2. - Journey or task undertaken by a spacecraft or astronauts
- 4. - Artificial object placed in orbit around a celestial body
- 6. - Relating to the Moon
- 8. - Act of sending a spacecraft into space
- 9. - Fourth planet from the Sun and a target for human exploration
- 13. - Person trained to travel and work in space
- 15. - Rocky object that orbits the Sun, mostly found in the asteroid belt
- 16. - Remote-controlled vehicle used for exploring the surface of other planets
- 17. - Instrument used to observe distant objects in space
- 18. - Path followed by a spacecraft around a celestial body