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12 billion years old, this interstellar comet is older than our Solar System

By Jonti Horner, Professor (Astrophysics), University of Southern Queensland

One year ago, on July 1 2025, astronomers discovered a fascinating new object moving through the Solar System. Detected by the Asteroid Terrestrial-impact Last Alert System (ATLAS), the object was quickly recognised as something special.

Tearing past at record speed, the comet, known as 3I/ATLAS,…

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