At what time did the universe cool to a temperature of about 3 K?
A) end of the inflationary era
B) end of the Planck time
C) very recently
D) era of recombination

Name: At what time did the universe cool to a temperature of about 3 K? A) end of the inflationary era B) end of the Planck time C) very recently D) era of recombination
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Question

Quizplus · Accepted Answer

The universe cooled to a temperature of about 3 K very recently, as it is the current temperature of the cosmic microwave background radiation.

At What Time Did the Universe Cool to a Temperature