New theory about the origin of Earth

New research suggests the Earth is made up of two planets that collided and fused together 4.5 billion years ago.  Huffington Post's Chris D'Angelo reports that our old theory is wrong, which was that a collision of the planet Theia into Earth was more of a glancing blow that spun off Earth's moon.   Instead, according to a NASA-funded research team:

"Earth wasn't just side-swiped by Theia . . . but sustained a direct hit and actually absorbed a large portion of the rogue planet. 

"In other words, Earth is made up of two fused planets -- Earth and Theia. . . .  Theia was thoroughly mixed into both the Earth and the moon, and evenly dispersed between them."

The UCLA-led research team compared the chemical makeup of rocks from the moon with volcanic rocks from Arizona and Hawaii.  They found little difference between chemical structures of rocks on the earth and the moon.   If the old theory was right, that Theia hit Earth in a glancing blow, spinning off the moon, the moon's chemistry would be mostly that of Theia.   That's not what they found.   The evidence suggests a direct hit, with Theia being largely absorbed into Earth. 

I kind of like the idea of having two planetary parents.    Seems more like a family thing and a harbinger of what was to come as people and social institutions gradually evolved over the years.

Ralph