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science2.5 millionA stellar event disrupted the Oort cloud 2.5 million years ago

A stellar event disrupted the Oort cloud 2.5 million years ago

The Gaia mission reconstructs the Solar System’s history, revealing a close stellar encounter 2.5 million years ago.

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The fact

This interaction may have altered the trajectories of long-period comets in the Oort cloud.

The data confirm the influence of neighboring stars on our cosmic environment.

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Why it matters

Cette découverte éclaire les dynamiques passées du Système solaire et renforce le lien entre les mouvements stellaires et les risques cométaires pour la Terre.

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Auto-synthesis from 1 media source · identified on July 5, 2026
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