Science

Earth's slowing spin may have shaped its primordial crust

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 05/11/2026, 15:25:25 UTC.

Briefings

A 2026 article suggests Earth's primordial crust formation was influenced by its rapid initial spin after a 4.5-billion-year-old impact that created the Moon. The planet's days were only two to five hours, but current models ignore how this speed changed over time. The evidence is limited to the impact event and the current lack of crustal models accounting for the slowdown.

Key points

• A 4.5-billion-year-old impactor collision with Earth 4.5 billion years ago ejected debris that formed the Moon.
• The collision left Earth spinning extremely fast with days lasting just two to five hours.

Context

Earth's first crust formation and evolution have largely overlooked how the planet's later slowdown might have affected it. This finding suggests the initial rapid spin could have shaped the primordial crust.

Limitations

The evidence is limited to the impact event and the current lack of crustal models accounting for the slowdown. No data on crustal composition, timing of crust formation, or long-term crustal evolution is provided.

Generated by Bittrees-hosted qwen35-2b sha256:aaf42c8b7c3c on 05/11/2026, 15:33:14 UTC. Based on publisher-provided feed evidence; may not cover the full original article. Check the source for details.

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