A mysterious object speeding through the Solar System has shown unusual acceleration, raising speculation that it could be a spacecraft from the former Soviet Union that went missing nearly 40 years ago. Known as 1998 KY26, the object is an 11-metre-wide body passing near Earth. Scientists have noticed that its trajectory cannot be fully explained by the gravitational pull of the Sun or Earth. This unusual behaviour is known as "non-gravitational acceleration", meaning that forces other than gravity are influencing the object's path and speed. NASA chief Jared Isaacman said on Thursday that the agency is monitoring KY26 but stressed there is no reason for concern.
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