History of the Universe

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Across
  1. 2. the height of a wave
  2. 5. the number of waves that pass a fixed point in a unit of time
  3. 7. lowest point of a wave
  4. 9. tiny atomic particle with little mass and a negative electric charge;an atom's electrons are equal in number to its protons and are located in a cloudlike region surrounding the nucleus
  5. 11. rhythmic movement that carries energy through matter or space and, in oceans, is generated mainly by wind moving over the surface of the water
  6. 13. the displacement of spectral lines toward longer wavelengths in radiation from distant galaxies and celestial objects
  7. 17. weak radiation that is left over from the early, hot stages of the Big Bang expansion of the universe
  8. 21. the distance between two identical points on consecutive waves
  9. 22. an instrument for forming and examining spectra especially in the visible region of the electromagnetic spectrum
  10. 23. large cloud of interstellar gas and dust that collapses on itself, due to its own gravity, and forms a hot, condensed object that will become a new star
Down
  1. 1. all types of electromagnetic radiation arranged according to wavelength and frequency
  2. 3. highest point of a wave
  3. 4. massive explosion that occurs when the outer layers of a star are blown off
  4. 6. natural or artificial substance that cannot be broken down into simpler substances by physical or chemical means
  5. 8. a table of chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure appear in vertical columns
  6. 10. collapsed, dense core of a star that forms quickly while its outer layers are falling inward, has a radius of about 10km, a mass 1.4 to 3 times that of the Sun, and contains mostly neutrons
  7. 12. theory that proposes that the universe began as a single point and has been expanding ever since
  8. 14. the combining of lightweight nuclei into heavier nuclei; occurs in the core of the Sunn where temperatures and pressure are extremely high
  9. 15. tiny atomic particle that has mass and a positive electric charge
  10. 16. change in the wave frequency that occurs due to the relative motion of the wave as it moves toward or away from an observer
  11. 18. tiny atomic particle that is electrically neutral and has about the same mass as a proton
  12. 19. number of protons contained in an atom's nucleus
  13. 20. small, extremely dense remnant of a star whose gravity is so immense that not even light can escape its gravitational field