Across
- 2. An instrument used to measure the intensity of light or other electromagnetic radiation.
- 4. A measurement of the progression of events from the past to the future
- 5. Unseen matter that does not emit, absorb, or reflect light, but has gravitational effects.
- 8. The study of the origin, structure, and evolution of the universe.
- 9. A point in space where matter is infinitely compressed and gravitational forces are infinite.
- 10. Density The amount of matter or energy required to close the universe
- 11. The unit of temperature in the Kelvin scale
- 12. A rapid expansion of space in the early universe, causing it to become larger and less dense
- 14. The distance that light travels in one year, approximately 5.88 trillion miles.
- 15. The apparent shift in the position of an object when viewed from different angles.
- 16. The change in frequency or wavelength of a wave as observed by an observer moving relative to the source
- 18. The interaction between electric and magnetic fields.
- 19. The shift of light towards longer wavelengths due to the expansion of the universe.
Down
- 1. The study of the interrelation of heat and mechanical energy
- 3. The scientific model that explains the origin of the universe as a rapid expansion from a hot, dense state.
- 6. A measure of the average kinetic energy of particles in a substance
- 7. The initial burst of light and energy that marked the beginning of the universe.
- 13. The process in which atomic nuclei combine to form heavier nuclei, releasing energy in the process.
- 17. The shift of light towards shorter wavelengths due to the motion of an object towards the observer.