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Across 1. A cluster of galaxies organized into larger groups 6. Stars in the giant branch of the Hotesprung-Russell diagram that pulsates in brightness 9. The universe began as a fluctuation in a vacuum and expanded very rapidly for a fraction of a second before settling into a more orderly expansion 10. The theory that the universe began as a point and has been expanding ever since 12. Pulsation periods between 1 and 100 days 13. Often giant elliptical galaxies that emit as much or more energy in radio wavelengths as they do in wavelengths of visible light 14. The cores of galaxies where the highly energetic objects of activities are located

Down 1. Alternating dense and less dense regions that are frozen in place and rotate as a rigid pattern 2. Weak radiation that appeared to come from all directions in space 3. The universe looks the same on large scales to all observers, and that it has always looked that wayv 4. The study of the universe, its current nature, and its origin and evolution 5. Periods of pulsation between 1.5 hours and 1 day 7. A spherical region where globular clusters are located 8. Value (H) used to calculate the rate that the universe is expanding; measured in km/second or mg/sec 11. Star-like objects with emission lines in their spectra