The interstellar object, Oumuamua continues to leave astronomers scratching their heads nearly six years after its original discovery. Though it *probably* isn't an extraterrestrial spacecraft.
. The researchers propose a model that explains 'Oumuamua’s acceleration as a result of the loss of hydrogen gas from its surface.
The idea has been suggested before, but the novelty of Bergner and Seligman’s analysis stems from how the researchers explain how the hydrogen got inside the object in the first place.moved through space mainly as a result of gravity. But its motion couldn’t be explained by gravity alone; it was accelerating, similar to comets that accelerate due to their continual loss of gas and dust.
This molecular hydrogen remained trapped in the frozen body of the object until it started to heat up as it approached our sun. As it heated, the ice changed its structure, releasing the trapped molecular hydrogen as a form of fuel, causing 'Oumuamua to rocket through our solar system.
Crucially, their theory doesn’t require a volume of lost hydrogen that could be visible from Earth. Thus, they conclude, 'Oumuamua appeared inactive while emitting enough hydrogen to propel it through space.But then why don’t we see similar non-gravitational forces acting on the thousands of comets we have observed in the solar system so far?
According to the researchers, such an effect seen in 'Oumuamua is a surface effect, where the sun's heat only penetrates the surface slightly. So, the larger the object, the less powerful the effect becomes. 'Oumuamua, with a diameter of roughly 330 feet, is a lot smaller than regular comets which often spanin diameter. Future observation of comets similar in size to 'Oumuamua should help astronomers know if they're on the right track.
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