Solar system slips back in time

Based on the extent to which uranium-238 and uranium-235 isotopes had decayed into their daughter isotopes lead-207 and lead-206, they say the solar system is 4.5682 billion years old. That's between 0.3 and 1.9 million years older than previous estimates, which relied mainly on the Allende meteorite that fell in Chihuahua, Mexico, in 1969.