【微特稿·科技与新知】已知第三个 外星系不明物体造访太阳系

Core Points - An unidentified object, possibly an interstellar visitor, has attracted the attention of astronomers from multiple countries, being referred to as A11pI3Z [1] - This object is located between the asteroid belt and Jupiter, several hundred million kilometers from Earth, and poses no threat of collision with Earth [1] - Researchers are uncertain whether A11pI3Z is a rocky asteroid or a comet composed of rock, ice, and dust, and its shape and size remain unknown [1] Group 1 - A11pI3Z has a peculiar trajectory and high speed, suggesting it may originate from outside the solar system, with an estimated width of around 40 kilometers according to a Spanish astrophysicist [1] - Harvard astrophysicist Avi Loeb speculates that A11pI3Z could be approximately 19 kilometers wide, which is considered large for objects traveling between different star systems [1] Group 2 - The first known interstellar visitor to the solar system was 'Oumuamua', discovered in October 2017, measuring about 400 meters in length [2] - If A11pI3Z is confirmed to be 19 kilometers wide, its mass would be 10 million times that of 'Oumuamua' [2] - The second known interstellar visitor, 21/Borisov, discovered in 2019, is analyzed to be a comet [2]