The Universe & Its Stars: The Big Bang Theory

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Across
  1. 2. the movement of an astronomical object's spectrum toward longer (red) wavelengths.
  2. 3. an early period in the universe when the temperature allowed neutral hydrogen and helium atoms to form.
  3. 6. matter that cannot be seen or detected using normal methods.
Down
  1. 1. a theory that describes the evolution of the universe.
  2. 4. the rapid expansion of the universe immediately after the big bang.
  3. 5. a faint electromagnetic energy signal that is seen in all directions in the universe.