Big Bang Crossword 2 Name:________________________

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Across
  1. 5. According to observations of redshift, the universe is _________.
  2. 7. The galaxy closest to the Milky Way.
  3. 8. The forming of a theory or conjecture without firm evidence.
  4. 9. The force that formed galaxies.
  5. 10. The likely fate of the universe.
  6. 12. The galaxy the Sun is in.
  7. 13. A hot “gas” of electrons and atomic nuclei.
  8. 17. The period after atoms formed but before stars formed.
  9. 19. Up to 380,000 years after the Big Bang, the universe was ______.
  10. 21. The force that holds protons and neutrons together.
  11. 23. ___________ or elementary particles cannot be subdivided.
  12. 24. The Type Ia kind are used to estimate the distance to the most distant galaxies.
  13. 25. At the center of each galaxy is a supermassive _____ ____.
Down
  1. 1. Composed of 2 up quarks and 1 down quark.
  2. 2. The Milky Way and Andromeda galaxies belong to this Group.
  3. 3. He proposed the theory of the Big Bang.
  4. 4. The universe’s expansion slowing down, stopping, and reversing
  5. 6. Stars whose brightness varies over days, that can be used as “standard candles”.
  6. 11. Stars are collected into these, which can be hundreds of thousands of light years across.
  7. 14. Most of the universe is this element, which indicates its youth.
  8. 15. A method to find the distance to the closest stars, by observing their shift over 6 months.
  9. 16. The current theory of the origin of the universe.
  10. 18. This quantity always increases, indicating that order evolves toward disorder and uniformity.
  11. 20. Like ordinary matter but with opposite electric charge.
  12. 22. He discovered that Andromeda was not a gas cloud but a distant galaxy.
  13. 26. With the right velocity, a star will do this rather than get pulled into the galactic center.