Riddle of Mysterious Interstellar Traveler's Acceleration Potentially Solved in New Study

CC BY 4.0 / ESO/M. Kornmesser / The first interstellar asteroid, `OumuamuaThis artist’s impression shows the first interstellar asteroid, `Oumuamua
This artist’s impression shows the first interstellar asteroid, `Oumuamua - Sputnik International, 1920, 23.03.2023
Having been detected on its way out of our system, 'Oumuamua exhibited a number of peculiar properties, such as non-gravitational acceleration that apparently wasn’t caused by outgassing as it left no trail of gas or dust in its wake.
A new study published online this week has offered a possible explanation for certain properties of 'Oumuamua – an interstellar object that was discovered by astronomers passing through the Solar System in 2017.
The authors of a new paper, Jennifer B. Bergner from UC Berkeley and Darryl Z. Seligman from Cornell University, postulate that this acceleration was probably a product of the release of hydrogen from H2O ice in the object.
The researchers suggested that hydrogen entrapped in 'Oumuamua was released when it got closer to the Sun, thus affecting the object's orbit.

"For a comet several kilometers across, the outgassing would be from a really thin shell relative to the bulk of the object, so both compositionally and in terms of any acceleration, you wouldn't necessarily expect that to be a detectable effect," Bergner said, as quoted in a UC Berkeley press release. "But because 'Oumuamua was so small, we think that it actually produced sufficient force to power this acceleration."

Previously, Harvard astronomer Avi Loeb suggested that 'Oumuamua could be an artificial object rather than some sort of a natural space object.
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