At an Age of 380,000 Years,the Temperature of the Universe

question 25

Multiple Choice

At an age of 380,000 years,the temperature of the universe had fallen to 3000 K,and electrons could then combine with protons to produce hydrogen gas instead of roaming freely through space.What major transition occurred as a consequence of this change in the universe at this time?

• A) The universe would have lost its electrical charge suddenly to become electrically neutral.
• B) The present laws of physics were applicable to the properties of the universe for the first time.
• C) The universe became transparent to light for the first time.
• D) Nuclear fusion no longer occurred below this temperature,so general fusion throughout the universe would have ceased.

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