A team of astronomers monitoring interstellar object 3I/ATLAS have found something a little surprising. Our third confirmed interstellar visitor appears to have changed color for the second time. Meanwhile, another team finds that the comet has begun to show signs of non-gravitational acceleration as it approached perihelion. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

For those of you who haven't been following the story of our third interstellar visitor, on July 1, astronomers at the Asteroid Terrestrial-impact Last Alert System (ATLAS) spotted an object hurtling through our Solar System on an escape trajectory. Given its velocity and its eccentricity between 6.1 and 6.2 , it was confirmed to be an interstellar object, the

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