Across
- 2. Galactic _____ is the point about which the disk of a spiral galaxy rotates.
- 4. Spiral _____ are coiled waves of gas compression that move through the Galactic disk, squeezing clouds of interstellar gas and triggering the process of star formation at they go
- 6. _____ matter is a term used to describe the mass in galaxies and clusters whose existence we infer from rotation curves and other techniques, but that has not been confirmed by observations at any electromagnetic wavelength
- 7. _____ galaxy is a galaxy composed of a flattened, star-forming disk component that may have spiral arms and a large central galactic bulge
- 10. Galactic _____ is a thick distribution of warm gas and stars around the center of a galaxy
Down
- 1. _____ lensing is the effect induced on the image of a distant object by a massive foreground object
- 3. Galactic _____ is a region of a galaxy extending far above and below the galactic disk, where globular clusters and other old stars reside
- 4. Galactic _____ is an immense, circular, flattened region containing most of our Galaxy's luminous stars and interstellar matter
- 5. _____ stars are stars whose luminosity changes with time.
- 8. Spiral _____ are pinwheel-like structures originating close to the Galactic bulge and extending outward throughout much of the Galactic disk
- 9. A gargantuan collection of stellar and interstellar matter-stars, gas, dust, neutron stars, black holes-isolated in space and held together by its own gravity