# Webb telescope finds interstellar comet had exotic, unfamiliar chemistry

> An interstellar comet that recently passed through the solar system may have formed as long as 12 billion years ago, making it one of the oldest planet-building materials ever observed.

- **Source:** [Mashable](https://mashable.com/science/james-webb-space-telescope-interstellar-comet-3i-atlas-chemistry?utm_source=gearopen.com&utm_medium=referral&utm_campaign=feed&utm_content=6a3a5fcc37aeee5dfab52292)
- **Published:** 2026-06-23
- **Category:** Science
- **Tags:** #galaxy
- **Canonical:** http://localhost:4321/a/6a3a5fcc37aeee5dfab52292

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_GearOpen's distilled summary. The full original article is published at Mashable (source link above); GearOpen does not republish the source's full text._