A strange circle on satellite maps turned out to be a 390-million-year-old impact crater

2026-09-22来源 Science Daily TechEnglish
An amateur astronomer searching satellite maps for a Quebec camping spot accidentally discovered a massive ancient impact crater. Scientists later found shatter cones that confirmed the 25-kilometer-wide structure was blasted into Earth roughly 390 million years ago.

原文：https://www.a8q9.cn/en/article/a-strange-circle-on-satellite-maps-turned-out-to-be-a-390-million-year-old-impac-b1ecd1.html

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