Hydrogen ice? Unheard-of composition could explain ‘Oumuamua’s weirdness

The weirdness of our solar system’s first known interstellar visitor stems from a very unusual composition, a new study suggests.

That visitor is ‘Oumuamua, which zoomed through Earth’s neighborhood in the fall of 2017 and is now streaking toward the dark depths of the outer solar system. The interloper puzzled researchers shortly after its detection, and the air of mystery surrounding the object hasn’t dissipated. 

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