If a Proton and a Neutron Came Together Before the First

Q13: Why are changes of state in the

Q14: The most recent "freezing" of the universe

Q15: Which of the following describes a quasar?<br>A)

Q16: Evidence for the Big Bang includes the<br>A)

Q17: Compare the expanding-balloon analogy of the universe

Q19: Which of the following was not a

Q20: What would happen to the estimate of

Q21: What is the fate of the universe

Q22: How is it that every point in

Q23: Why do scientists think that dark matter