A Idade do Universo

Gauging Age of Universe Becomes More Precise

By KENNETH CHANG
Published: March 9, 2008
The New York Times
The universe is 13.73 billion years old, give or take 120 million years, astronomers said last week.That age is based on precision measurements of the oldest light in the universe.


About 380,000 years after the Big Bang, the universe cooled enough for protons and electrons to combine into hydrogen atoms. That released a burst of light, which over the billions of years since has cooled to a bath of microwaves pervading the cosmos.