外星系不明物体造访太阳系

Group 1 - The unidentified object, designated A11pI3Z, is potentially the third "interstellar visitor" known to have entered the solar system, as reported by the European Space Agency [1] - A11pI3Z is currently 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 [2] Group 2 - The trajectory and high speed of A11pI3Z suggest it may originate from outside the solar system, with estimates of its width ranging from approximately 19 kilometers to 40 kilometers [2] - If A11pI3Z is confirmed to be 19 kilometers wide, its mass would be 10 million times that of the first known interstellar visitor, 'Oumuamua', which is about 400 meters long [2] - The second known interstellar visitor, 21/Borisov, discovered in 2019, is identified as a comet [2]