News Summary

• Astronomers first spotted 3I/ATLAS hurtling at 210,000 kilometres per hour, marking it as the third confirmed interstellar object to visit our solar system.
• Its perihelion, the closest point to the Sun, occurred on 29 October 2025, at approximately 1.4 astronomical units or 210 million kilometres.
• Hubble's sharp imaging enabled astronomers to estimate its nucleus size at up to 15 kilometres in diameter, far larger than expected for typical comets.
• Further analysis pegs its mass at over 33 billion tons, deeming it 'anomalously massive' and challenging standard comet models.