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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

On July 20th, 1969, humankind finally set foot on the surface of the moon.

50 years later, a big mystery remains. How the heck the moon got there in the first place?

For decades, the thinking on that has been that four and a half billion years ago, a Mars-sized

proto-planet smashed into the Earth. When the dust settled, our moon remained, forged from the

debris of Earth and that other object. The problem is, as scientists have taken more and more precise

isotopic measurements of the Moon, they've found that it's nearly identical in composition

to the Earth,

not some other object.

A problem that I've been advertising is an isotopic crisis.

Jay Malash studies planetary impacts at Purdue University.

Now he says a new theory in the journal Nature Geoscience may at least point to a way out

of that isotopic crisis, of the moon's chemical

isotopes so closely resembling Earths. Here's the idea. The authors, a team of Japanese

scientists, write that maybe in those early days of the solar system, the Earth was sloshing with

oceans of magma. Then, when the Mars-sized objects slammed into those molten seas, their models predict a lot more

Earth-derived material gets ejected into orbit in the form of scorching vapors.

...