Across
- 4. a star that has expanded significantly in size and luminosity compared to a main sequence star, such as the Sun
- 5. the dense, Earth-sized core of a star that has exhausted its nuclear fuel
- 6. a spiral galaxy containing our solar system, estimated to contain hundreds of billions of stars
- 7. a cloud of gas and dust in outer space
- 9. exceptionally large and luminous stars, typically much bigger and brighter than giants
- 10. flat, thin, and circular like a disc
- 11. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
Down
- 1. the group in which a star is classified according to its spectrum, especially using the Harvard classification
- 2. the intrinsic brightness of a celestial object (as distinct from its apparent brightness diminished by distance
- 3. a graph that plots the absolute magnitude (intrinsic brightness) of stars against their spectral types (surface temperatures)
- 6. a series of star types to which most stars belong, represented on a Hertzsprung–Russell diagram as a continuous band extending from the upper left
- 8. all existing matter and space considered as a whole