Age dating uranium
This "differentiation" occurred shortly after the giant impact(s), when a global liquid-magma ocean initially present on the moon cooled and solidified.
And this solidification left a signal, Barboni said — a mineral called zircon.
"If you want to date this process, we use the mineral zircon, because that's the best time capsule you can find," she said.
Moreover, there are other fossils from two sites in Ethiopia: 195,000-year-old fossils from Omo, and 160,000-year-old fossils from Herto, and "the fossils from both of these sites are considered by anthropologists to represent ," Quam said.
But ample evidence exists to prove that the world has been around for much, much longer.
Scaramucci brought up Earth's age to note that scientists had been incorrect in the past, and thus might be wrong that human activity is primarily to blame for modern-day climate change.
The age the team came up with for the moon — 4.51 billion years, give or take 10 million years — should therefore stand the test of time, Barboni said.
"We were able to correct for everything that was a problem before, the reasons people said zircon couldn't be used," she said.[7 Theories on the Origin of Life] But exactly how old are humankind and the planet, and what evidence do scientists have for these dates?