Across
- 3. A region in the Hertzsprung-Russell (H-R)diagram containing most stars in the universe.
- 4. A city-sized, dense object that is the remnant of a supernova or collapsed white dwarf.
- 6. A graph used to classify stars based on their color/temperature class and their brightness or luminosity.
- 9. An immense star; located at the top of the Hertzsprung-Russell (H-R) diagram.
- 10. A huge, loose mass of billions of stars, other astronomical objects, and dust held together by gravity. They exist as spiral, barred spiral, elliptical, or in irregular forms.
- 12. A hot, dense core of a dead star.
- 14. A hot, dense collection of matter deep within a nebula that secular cosmologists believe will eventually form a star when nuclear fusion begins.
- 15. A star’s brightness as it would appear at a standard distance from the star
- 17. An immense cloud of interstellar gas and dust.
- 18. Invisible matter that secular cosmologists say must exist in the universe to create enough gravity to make their cosmological model work.
- 22. One of 88 groups or patterns of stars usedto subdivide the heavens in order to locate and name individual stars.
- 23. The violent end of stars of greater than about 8 solar masses; a brilliant explosion that leaves behind a dead core such as a white dwarf, neutron star, or black hole.
- 24. A group of stars close enough to be held together by gravity.
Down
- 1. A body of knowledge that attempts to explain how the universe began and how it has changed over time.
- 2. Unusual stars that regularly change brightness as they expand and contract in size.
- 5. One of a pair of gravitationally connected stars that revolve around each other.
- 7. An unusual celestial object that is as bright as a galaxy but is compact and looks like a distant star in a telescope.
- 8. The change of the observed spectrum of a star to longer wavelengths due either to the distance to the star or to its speed away from Earth.
- 11. The apparent change in position of a distant object as one’s viewing position changes
- 13. A star’s relative brightness as viewed from Earth.
- 16. A violent nuclear explosion that occurs when a white dwarf draws in hydrogen from a larger companion star in a stellar binary system.
- 19. A large, luminous reddish star that forms when a star with about the mass of the sun enters its final stages of existence as its hydrogen fuel is used up
- 20. The distance light travels in a year; a useful unit of interstellar distance; about 9.7 trillion_km (6 trillion_mi)
- 21. A strange astronomical object so massive and dense that its intense gravity prevents even light from escaping.