Space Weather News for Dec. 16, 2025
https://spaceweather.com
THE NON-GRAVITATIONAL ACCELERATION OF 3I/ATLAS: New data from NASA's Psyche spacecraft and ESA's Mars Trace Gas Orbiter confirm that interstellar comet 3I/ATLAS is not moving under the force of gravity alone. It has a "non-gravitational acceleration." The effect can be explained entirely by cometary outgassing, and allows astronomers to weigh the comet from afar.
Full story @ Spaceweather.com (
https://spaceweather.com) .
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