From the June 2010 issue

The universe has billions of galaxies and billions of stars, so why is space dark?

John E. Mortensen, Easton, Pennsylvania
By | Published: June 28, 2010 | Last updated on May 18, 2023
hubble ultra deep field
Called the Hubble Ultra Deep Field, this galaxy-studded view represents a core sample of the universe.
NASA, ESA, and S. Beckwith (STScI) and the HUDF Team

At 13.7 billion years, the universe is old but not infinitely so, and stars themselves have finite life spans.