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url: https://arstechnica.com/science/2026/07/the-missing-500-million-cosmic-bombardment-melted-earths-first-crust/
url_hash: 5fcac6e0968a1d30a06fcae12a62b5c67a6dd4a53ff5398b658186940c6c0b7e
canonical_url: https://arstechnica.com/science/2026/07/the-missing-500-million-cosmic-bombardment-melted-earths-first-crust
source: ArsTechnica
category: news/tech
category_raw: tech
region: usa
tags:
- it_general
- it_tech
- it_ai
lang: en
published_at: '2026-07-05T10:55:02Z'
fetched_at: '2026-07-06T16:20:32Z'
updated_at: '2026-07-06T16:22:16Z'
status: published
content_hash: null
license_note: link-only
summary: null
summary_source: null
summary_en: null
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title: 'The missing 500 million: Cosmic bombardment melted Earth''s first crust'
---

# The missing 500 million: Cosmic bombardment melted Earth's first crust

## TL;DR
（要約なし・原文はリンク先を参照 / No summary available; see the source link.）

## Key Points
- it_general / it_tech / it_ai

## Details
(本文なし。リンク先参照)

## Source
元記事: [The missing 500 million: Cosmic bombardment melted Earth's first crust](https://arstechnica.com/science/2026/07/the-missing-500-million-cosmic-bombardment-melted-earths-first-crust/) — published 2026-07-05T10:55:02Z