New view of nature’s oldest light adds fresh twist to debate over universe’s age

The Atacama Cosmology Telescope measures the oldest light in the universe, known as the cosmic microwave background. Using those measurements, the 140-person science team has calculated the universe’s age as 13.77 billion years. The project has been led by Princeton researchers since its inception, first Lyman Page and now Suzanne Staggs. In addition, 58 of the co-authors of two new papers are present or former Princeton researchers.