Big Bang Vocabulary

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Across
  1. 3. we can tell stars and galaxies are moving away from us because the wavelength of light gets stretched. We call this effect ________
  2. 4. The name of the theory that says the universe began as a huge explosion
  3. 7. A puzzling phenomenon astronomers study now revolves around the fact that universe is expanding at a _____ rate
  4. 10. Space itself is expanding - this means that there is no __ of the universe. This is a hard concept to understand, so we use analogies like ants on a balloon to illustrate it.
  5. 11. These particles came into existence about 4 minutes after the Big Bang
Down
  1. 1. “Noise” that telescopes detect in all directions in space; the “smoke” of the Big Bang
  2. 2. Along with Robert Wilson, this American astrophycisist is credited with the discovery of cosmic background radiation
  3. 5. The reason why the Big Bang happened?
  4. 6. The second most common type of element in the universe. Much of this element was created just after the Big Bang
  5. 8. Huge objects made of stars that are moving apart from one another; ours is called the Milky Way
  6. 9. This is the word we use to describe the universe growing in size
  7. 12. The prediction of the ____ of hydrogen and helium from the conditions of the Big Bang matches our observations. This is a piece of evidence supporting the Big Bang theory!