When the cosmic background radiation orginates from a time that was _____ after the Big Bang. Question 17 options: 380,000 years 1-2 billion years about 5 minutes 0.001 seconds Question 18 (2 points) Listen Why can we see clearly all the way back in time to the beginning of the era of atoms? Question 18 options: Because space has expanded since then, giving photons of light more 'wiggle room.' Because since that time, space is no longer a plasma filled with free electrons to scatter light. [All of the choices shown are true and correct answers to this question.] [This is complete nonsense. We cannot see "back" in time any better than we can see "into the future."] Because atoms do not emit microwaves and so do not interfere with the cosmic microwave transmission