Cosmology Vocabulary

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Across
  1. 2. Extremely bright objects in the universe, but also very far from earth. These objects may be light emitted from the “accretionary disc” around a super-massive black hole. Only formed during the early universe.
  2. 6. Expansion will eventually slow due to gravity and then reverse. All of the universe will collapse back together into a single point. This idea has been disproved as the expansion force of dark energy is greater than the contraction force of gravity.
  3. 7. (CMBR)The leftover heat energy from the Big Bang that is visible in every part of the universe. A “baby picture” of the universe.
  4. 11. The magnitude of the wave height.
  5. 14. Galaxies are moving away from Earth at a rate proportional to their distance from Earth. Distant galaxies are receding faster than closer galaxies.
  6. 15. The mysterious force that is accelerating expansion of the universe. This makes up 65% of the universe.
  7. 16. An infinitely small, infinitely dense, and infinitely hot point from which the universe expanded.
  8. 18. The generally accepted theory to explain the origin of the universe. The Big Bang theory states that the universe formed during a single event in which all matter and energy suddenly expanded from an extremely small point.
  9. 19. A fundamental force of the universe. Any object with mass will exert a gravitational pull on any other object with mass.
  10. 20. Matter (or mass) in the universe that we cannot see directly. We only see its gravitational effect on stars and galaxies. 27% of the universe.
Down
  1. 1. Anything that takes up space and has mass. All the “stuff” of the universe. Only 5% of the universe.
  2. 3. The idea that the universe always existed in much the same size and composition as we now observe it. This idea was replaced by the Big Bang Theory.
  3. 4. The rate at which something occurs or is repeated over a particular period of time.
  4. 5. Due to expansion, galaxies and stars will become so distant from each other that no other light can be seen. The universe will be a cold, dark, lonely place.
  5. 8. A ratio of 75% hydrogen atoms and 25% helium atoms is measured throughout the universe. This matches the prediction from the big bang theory.
  6. 9. The distance between identical points (adjacent crests) in a waveform signal.
  7. 10. The extremely rapid expansion of the universe outward from the singularity point. This happened faster than the speed of light.
  8. 12. The science which studies how the universe began and how it has changed over time.
  9. 13. A Doppler effect of light where the wavelength is stretched out, shifting it toward the red end of the spectrum. This happens when objects are moving away from each other.
  10. 17. Expansion due to dark energy will continue. Eventually, everything will be ripped apart. Stars, galaxies, even atoms and subatomic particles will not hold together.