Letters

Your cosmic questions
Regarding the “The vital statistics” in “Cosmic questions, answers pending” (SN: 4/23/11, p. 20), I was puzzled by two values: 13.75 billion years (time since the Big Bang) and 90 billion light-years (diameter of the universe). If light has been streaming away for 13.75 billion years, then shouldn’t the diameter of the universe be 27.5