Interstellar object 3I/ATLAS is much older than the solar system itself

A recent study published in the journal Nature has revealed that the interstellar comet 3I/ATLAS is an exceptionally ancient object, formed nearly 10–12 billion years ago, and possesses a chemical composition unlike any known object in the Solar System.

Key Findings

• Scientists estimate that 3I/ATLAS formed in a primordial planetary system around another star, making it one of the oldest known comets.
• Isotopic analysis shows that the comet’s water is highly enriched in deuterium (heavy hydrogen), with a deuterium-to-hydrogen (D/H) ratio of about 0.98%, more than ten times higher than that found in known Solar System comets.
• The unique elemental composition suggests that the comet originated under physical and chemical conditions very different from those that formed the Solar System.

What are Interstellar Objects?

• Interstellar objects are celestial bodies that originate outside the Solar System and pass through it.
• They are the only directly observable samples of icy planetesimals formed around other stars.
• Their study provides valuable insights into the diversity of planet formation processes and the chemical environments of exoplanetary systems.

Why is 3I/ATLAS Important?

• It is the third confirmed interstellar object detected passing through the Solar System.
• The name 3I/ATLAS indicates:
  • 3I: Third confirmed interstellar object.
  • ATLAS: Discovered by the NASA-funded Asteroid Terrestrial-impact Last Alert System (ATLAS) in 2025.
• The comet provides a rare opportunity to study material formed around another star without leaving the Solar System.

Confirmed Interstellar Objects

Interstellar Object	Year of Discovery	Key Feature
1I/ʻOumuamua	2017	First confirmed interstellar object, discovered by the Pan-STARRS1 telescope in Hawaii.
2I/Borisov	2019	First confirmed interstellar comet.
3I/ATLAS	2025	Third confirmed interstellar object; found to be 10–12 billion years old with an unusual isotopic composition.

Sources: Nature, NASA

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