<|begin_of_text|><|begin_of_text|><|begin_of_text|>A bizarre interstellar object called 'Oumuamua continues to perplex astronomers a year after it vanished. Here's why a few scientists still wonder if it was alien.
An illustration of the space object 'Oumuamua flying through the<wm> Milky Way galaxy. Source: ESA/JPL-Caltech
In 2017 and 2018, a peculiar, cigar-shaped interstellar object entered our solar system, striking fear into the hearts of scientists worldwide. "What did 'Oumuamua, a passing star, then turn into a small asteroid?" Such as it were. Over time, the scientific community came to agree on what it's likely to be. Yet the search for its identity and to prove or prove its extraterrestrial</wm> origin remains ongoing.
Scientists use several lines of evidence from observations of the object's trajectory, motion and