Across
- 5. Molecules formed by atoms consisting of antiprotons, antineutrons, and positrons
- 7. A variable star having a regular cycle of brightness with a frequency related to its luminosity
- 9. Region of space having a gravitational field so intense that no matter or radiation can escape
- 11. The displacement of spectral lines toward longer wavelengths in radiation from distant galaxies and celestial objects
- 12. A completely empty space
- 14. Increase in prices and fall in the value of money
Down
- 1. The degree or intensity of heat present in a substance or object
- 2. Non-luminous material that is postulated to exist in space
- 3. A nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy
- 4. Unit of astronomical distance equivalent to the distance that light travels in one year
- 6. SI base unit of thermodynamic temperature
- 8. An instrument for measuring the intensity of light
- 10. Science of the origin and development of the universe
- 13. A system of millions or billions of stars held together by gravitational attraction
- 15. A point of time as measured in hours and minutes past midnight or noon