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Big Bang Basics

                                   
                                   
                                   
                               
                             
                 
                   
               
                             
                         
                           
                 
               
                               
             
                                 
Across
  1. 5. 75 percent of the visible universe is made up of ________ and 25 percent is helium.
  2. 7. The cyclic model indicates that our universe consists of _______ dimensions.
  3. 8. ___________ _______________ is the mysterious force that scientists think is driving the universe's current accelerating expansion.
  4. 11. The discovery of the cosmic microwave background radiation was found because no matter where the telescope was pointed, astronomers received __________.
  5. 12. A point of infinite density and temperature is called a _____
  6. 13. The universe is expanding at an _____ rate.
Down
  1. 1. The earliest stars began shining after 300 ______ years.
  2. 2. In the steady state theory, new particles were continually being ________.
  3. 3. How do heavier elements get spread throughout the universe?
  4. 4. The scientists that study the Big Bang theory are called ___________.
  5. 6. The picture gotten by the Wilkinson Microwave Anisotropy Probe (WMAP) satellite shows the universe at 4.5 _____ years old.
  6. 9. After the universe underwent inflation, it was probably filled with a hot, dense _______.
  7. 10. Because you know that space is expanding, you can tell that the universe was once_______.