Oumuamua and the Hydrogen-Outgassing Hypothesis for Its Elongated Shape and Anomalous Acceleration

To the point

Jennifer Bergner and Darryl Seligman propose that Oumuamua’s odd acceleration and elongated shape arise from hydrogen outgassing from trapped gas in porous amorphous water ice as it heats, while Karen Meech cautions it could still be a regular comet with undetected gases, and future interstellar visitors observed by the Rubin Observatory may help resolve which explanation is correct.

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npr.org

Scientists think they know why interstellar object Oumuamua moved so strangely

A strange comet-like object discovered over five years ago was the first known visitor from another solar system. Its movement was so odd that scientists struggled to explain it, until now.