News Astronomy

Old stars reveal universe’s minimum age

By Linda Wang

- More than 2 years ago

Astronomers agree that the universe began in a Big Bang. Just how long ago that was remains a matter of debate.

Researchers detected uranium for the first time in an ancient star’s absorption spectra. R. Cayrel et al./Nature

Now, using a more precise chronometer, an international research team estimates the universe to be at least 12.5