Across
- 1. A continuum of all electromagnetic waves arranged according to frequency and wavelength, from radio waves to gamma radiation
- 3. A person trained to be part of a spacecraft crew
- 5. A galaxy with a bulge in the center and very distinct long arms winding around the center
- 8. Objects, such as planets, moons, and stars, that are located in space
- 10. Streaming arcs of millions of stars swirling around the center of a spiral-shaped galaxy
- 12. A galaxy with very little symmetry that does not fit into any category
- 16. A complex system of garments that allows an astronaut to work safely outside a spacecraft
- 17. The galaxy in which Earth and the Sun are located
- 18. Rotation center of a galaxy
- 19. The management of the resources of a community, country, etc., especially with a view to its productivity
- 20. The quality in a person or society that arises from arts, manners, and scholarly pursuits
Down
- 2. A galaxy with a long oval shape, a bright center, no apparent internal structure or spiral arms, and very little dust or gas
- 4. A unit of length equal to the distance that light travels through space in one year
- 6. A large grouping of stars in space
- 7. A large celestial body that revolves around a star in a solar system
- 9. All of space and the matter space contains
- 11. A celestial body consisting of a mass of gas held together by its own gravity in which the energy is generated by nuclear reactions in its interior
- 13. A star and the group of planets and other celestial bodies that are held by its gravitational attraction and revolve around it
- 14. A measure of how far apart two objects are
- 15. The investigation of physical conditions in space and on stars, planets, and other celestial bodies through the use of satellites, space probes, or spacecraft with human crews