Across
- 4. variable stars have luminosity that depends on this
- 9. Another name for the output power of a star
- 11. the type of bluish star typically found in class O
- 13. one of the axes on a Hertzsprung-Russell diagram
- 17. standard star whose luminosity can be determined independently of its distance
- 21. unit of distance equalling the radius of the earth´s orbit
- 22. red shift is a special case of this phenomenon
- 23. the angle that defines a parsec
Down
- 1. nuclei of this gas are fused when the star runs out of hydrogen
- 2. Hubble´s constant multiplied by the distance of the galaxy
- 3. gravitational effect that causes a bending of light
- 5. the quantity that determines the fate of the universe
- 6. a common unit of distance in astronomy
- 7. this counteracts the effect of gravity to prevent stars from collapsing
- 8. the diagonal line across a Hertzsprung-Russell diagram shows the main .............. stars
- 10. word that describes movement away from an observer
- 12. earliest stage in star formation
- 14. one quarter of the universe is made of dark....
- 15. the largest element that can be formed from fusion in a massive star
- 16. type of spectrum with white lines on continuous background
- 18. the type of reddish star typically found in class M
- 19. Whose law relates the peak output wavelength to the temperature?
- 20. "energy" responsible for the accelerating expansion of the universe
- 24. final stage in the life of the most massive stars