science

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Across
  1. 6. A system with two opposite charges or poles separated by distance
  2. 9. The apparent shift in an object's position when viewed from different places
  3. 11. The leftover microwave radiation from the early universe
  4. 13. A telescope in orbit around Earth that observes distant space objects
  5. 14. The average density needed for the universe to be flat
  6. 16. A region in space where gravity is so strong that light cannot escape
  7. 18. The dimension used to describe change and the order of events
  8. 19. The overall geometry of the universe, such as flat, open, or closed
  9. 21. A measure of the average kinetic energy of particles
  10. 22. Matter made of particles with opposite charges to normal matter
  11. 23. The distance light travels in one year
Down
  1. 1. The process where small atomic nuclei combine and release energy
  2. 2. The model that the universe began hot, dense, and has been expanding
  3. 3. Energy cannot be created or destroyed, only transformed
  4. 4. A point where density and gravity become extreme and normal physics breaks down
  5. 5. The stretching of light to longer wavelengths, usually from objects moving away
  6. 7. Invisible matter that does not emit light but has gravitational effects
  7. 8. The SI unit of temperature based on absolute zero
  8. 10. A change in wavelength caused by motion of the source or observer
  9. 12. Bright or dark lines in a spectrum that reveal the presence of elements
  10. 15. A device used to measure the brightness of light
  11. 16. The compression of light to shorter wavelengths, usually from objects moving closer
  12. 17. Huge regions of space containing very few galaxies
  13. 20. The period in the universe when matter dominated over radiation