Across
- 6. matter composed of the antiparticles of the corresponding particles in "ordinary" matter
- 7. device that measures the strength of electromagnetic radiation
- 9. the difference in direction of a celestial object as seen by an observer from two widely separated points
- 10. region where the curvature of spacetime becomes infinite
- 12. stars whose regular light variations are related directly to its luminosities
- 14. the study of the electromagnetic force between charged particles
- 15. SI base unit of temperature
Down
- 1. an increase in wavelength and decrease in frequency and photon energy
- 2. the displacement of the spectrum of an approaching celestial body toward shorter wavelengths
- 3. exponential expansion of space
- 4. a pair of equal and oppositely charged or magnetized poles
- 5. a system of billions of stars held by a gravitational attraction
- 8. measure of hotness or coldness
- 11. continued sequence of existence
- 13. the science of the origin and development of the universe
- 16. a completely empty space