Scientists offer ‘non-alien explanation’ for interstellar visitor

PARIS, March 23 — When the first object ever known to have visited the Earth’s Solar System from outer space zoomed past in 2017, it was so strange that at least one leading...

PARIS, March 23 — When the first object ever known to have visited the Earth’s Solar System from outer space zoomed past in 2017, it was so strange that at least one leading astronomer was convinced it was an alien vessel.

Astronomers had long been searching for comet-like objects entering the Solar System from the vastness of interstellar space, but had never before observed one. Scientists were left with four months’ worth of seemingly contradictory data to try to make sense of, leading to a range of theories.Jennifer Bergner, an expert in astrochemistry at the University of California, Berkeley, and co-author of a new study, told AFP that many of the theories “stretched the imagination”.

When ‘Oumuamua neared the Sun, the heat released the trapped hydrogen, acting as a “thruster boost” that propelled the object on its unexpected path, she said., said that “Jenny’s definitely right about the entrapped hydrogen”. He pointed to the large cometary tail seen on 2I/Borisov, the second known visitor from outside the Solar System, which was spotted in 2019.

Bergner suggested the reason ‘Oumuamua did not have a tail or coma was that it was far smaller than any comet — including 2I/Borisov — that had ever been observed.In the coming years many more comets, potentially from both within and outside the Solar System, could be spotted by the Rubin Observatory Legacy Survey of Space and Time in Chile, which is expected to begin its imaging project in 2025.

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