Because the universe has continued to expand over the past 13.7 billion years,the radius of our cosmic light horizon is greater than 13.7 billion light-years;the present radius is about 47 billion light-years.

Question

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The universe has continued to expand since the Big Bang, which means that the radius of our cosmic light horizon has also increased. This means that the present radius of our cosmic light horizon is greater than 13.7 billion light-years, and it is estimated to be about 47 billion light-years.

Because the Universe Has Continued to Expand Over the Past