In October 2017, astronomers discovered an anomalous celestial body in the solar system -Oumuamu, Oumuamu is cigar-shaped, 400 meters long, 40 wide, and has an amazing aspect ratio. 10:1. It is necessary to know that the aspect ratio of asteroids and comets in the solar system is generally not more than 3:1. Further observations show that the eccentricity of the orbit of Aumamo is as high as 1.1922, and the orbit is a hyperbola, indicating that Aumamo comes from Outside the solar system, it was the first interstellar celestial body known to mankind, which caused people's heated discussion for a while.
Although humans can no longer observe Omomo through the telescope after October 2018, scientists have never stopped studying Omomo. Astrophysicist Avi Loeb of Harvard University believes: Aomomo may be a relic of the alien spacecraft, such as the things in the light sail.
Avi Loeb did a research on several abnormal behaviors of Aumomo, and believes that Aumomo may be a product of alien civilization. First of all, Aumomo does not have a comet tail like comet when it approaches the sun. Aomomo is not made of ice, which means that the surface of Aomomo is solid, but it is impossible to distinguish between rock and metal.
When normal celestial bodies are far away from the sun, they are bound to decelerate under the action of the sun's gravity. However, Oumomo has an abnormal acceleration behavior. This behavior made people speculate that Oumomo may be an alien spacecraft, causing people to infinite Imagination.
Although scientists have proposed various explanations. For example, physicists Seligman and Lawton of the University of Chicago and believe that Omomo is an "iceberg" composed of hydrogen molecules. When solid hydrogen is sublimated by solar radiation, it will not The formation of the comet tail gave Oumomo an unusual momentum, but this explanation was not widely recognized.
Avi Loeb conducted an analysis in a paper and believed that such a slender celestial body could not exist in nature, and that the light of the star could drive the acceleration, and the speed was as high as 40 kilometers per second. He thought it was possible It is the light sail of an alien, a light sail abandoned by an advanced civilization. Avi Loeb proved his point from the shape, gloss, and movement of Omomo.
For example, during the rotation of Oumomo, the brightest and darkest reflections differ greatly. This is different from any asteroid or comet discovered in the past. This leads to two possibilities: Either Oumomo is long and narrow. Cigar-like objects, or slightly smaller butterflies. Traditional views tend to favor the former, while Avi Loeb supports the latter.
Regarding the abnormal acceleration of Aumamo, even if the most advanced telescope on the earth is used for spectral analysis, no trace of gas overflowing from Aumamo has been observed, which also hinders the view of "hydrogen iceberg". Vi Loeb thought that Omomo might be a light sail propelled by the sun, perhaps an object abandoned by an alien civilization, and then accidentally broke into the solar system.
speculates based on the last observation position of Aumamo that Aumamo will cross the Neptune orbit in 2022, and then gradually leave the solar system.
Avi Loeb’s view that Aumamo is a product of alien civilization is extreme, and it has also been opposed by many scientists. Research by other scientists has shown that although we cannot determine the material of Aumamo, its spectral analysis shows , The spectral characteristics of the surface of Aumamo are not significantly different from other asteroids.
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