20260824

Remnants of Theia, the Planet that Crashed into Earth

PSI Blog 20260824 Remnants of Theia, the Planet that Crashed into Earth

 

Might have produced the Moon too


Theia remnants inside Earth may survive as two giant mantle blobs left by the collision that created the Moon. (CREDIT: Shavit via Shutterstock)

 

Thanks to George Coyne for this heads up:

 

https://www.thebrighterside.news/post/scientists-discover-remnants-of-theia-the-planet-that-collided-with-earth-4-5-billion-years-ago/

 

Actually, I have followed this for over half a century. Turning down a postdoc working on lunar samples at my alma mater, I got one at the USGS Nuclear Science Building in Denver. I worked on nuclear activation analysis correlation of volcanic ash throughout the West, but a couple of my colleagues got some lunar samples. They were the first to get an age for bulk samples (4.66 billion years).[i] Subsequent work with zircon (a closed system) did not include extrasolar cosmic dust contaminants having irrelevant Pb and U ratios. Those got an age of about 4.5 billion.  


[i] Tatsumoto, Mitsunobu, and Rosholt, John N., 1970, Age of the Moon: An Isotopic Study of Uranium-Thorium-Lead Systematics of Lunar Samples: Science, v. 167, no. 3918, p. 461–463. 10.1126/science.167.3918.461



PSI Blog 20260824

 

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2 comments:

  1. AnonymousAugust 26, 2026 at 1:43 AM

    How could a Theia collision made the locked Lunar orbit around the Earth? This points more towards a common formation process of the Earth and the Moon.at almost the same time.

    ReplyDelete
  2. Glenn BorchardtAugust 31, 2026 at 12:07 PM

    Close. The collision at 4.5 Ga produced a molten Moon close to Earth. Gravitation produced a tidal effect that caused the Moon to be egg-shaped. Subsequent resistance furnished by its macrocosm (aether and whatever was in Earth orbit) caused the Moon's rotation to slow down. Ultimately, it developed a slow enough rotation to match that of Earth.

    ReplyDelete

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