Across
- 3. old (11–13 billion years), metal-poor stars found primarily in galactic halos and globular clusters
- 4. The galaxy that we call home
- 9. uses intense, compact radio emission from molecules like Silicon Monoxide (SiO) or Hydroxyl (OH) in the circumstellar envelopes of late-type giants and supergiants to map stellar atmospheres
- 11. Galaxies are rotating spirals
- 14. loosely bound groups of tens to thousands of young stars formed from the same molecular cloud
- 15. an interstellar cloud of dust and gas that shines by scattering and reflecting light from nearby stars
Down
- 1. collection of ancient stars
- 2. young, metal-rich stars found primarily in the spiral arms and disk of galaxies like the Milky Wa
- 5. the hypothetical first generation of stars formed from primordial gas
- 6. a region of the sky, roughly 20-25% of the total, that appears empty of distant galaxies to optical telescopes because it is obscured by dust, gas, and stars within the Milky Way's galactic plane
- 7. a dense interstellar cloud of dust and gas that appears inky black
- 8. a dense, centrally located, mostly old population of stars within a spiral galaxy
- 10. a massive, extended, nearly spherical region surrounding a galaxy, containing old stars, globular clusters, and hot gas
- 12. interstellar clouds of ionized gas that emit their own light at visible wavelengths,
- 13. flattened, rotating systems of gas, dust, or stars orbiting a central body, formed due to the conservation of angular momentum