外星系不明物体造访太阳系

Core Viewpoint - An unidentified object, potentially an interstellar visitor, has garnered attention from astronomers worldwide, being the third known object to visit the solar system from outside [1][2]. Group 1 - The object, designated A11pI3Z, is currently located between the asteroid belt and Jupiter, several hundred million kilometers from Earth, and poses no collision threat to 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]. - The object's unique trajectory and high speed suggest it may originate from an external star system, with estimates of its width around 40 kilometers [2]. Group 2 - Comparatively, the first known interstellar visitor, 'Oumuamua', discovered in October 2017, is approximately 400 meters long, while A11pI3Z could be significantly larger, with a mass potentially 10 million times that of 'Oumuamua' if its width is confirmed to be 19 kilometers [2]. - The second known interstellar visitor, 21/Borisov, discovered in 2019, is identified as a comet [2].