Interstellar object
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An interstellar object is an astronomical object in interstellar space, not gravitationally bound to a star. The term is used for objects including some asteroids, some comets, and rogue planets, but
Interstellar visitors in the Solar System cover the whole range of sizes – from kilometer large objects down to submicron particles. Also, interstellar dust and meteoroids carry with them valuable information from their parent systems. Detection of these objects along the continuum of sizes is, however, not evident.
3I/ATLAS
Comet Hyakutake (C/1996 B2) might be a former interstellar object captured by the Solar System
2I/Borisov
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2I/Borisov, originally designated C/2019 Q4, is the first observed rogue comet and the second observed interstellar interloper, after ʻOumuamua. It was discovered by the Crimean amateur astronomer and
Interstellar object
…interstellar space as stars do. As of 2025, three interstellar objects have been discovered traveling through the Solar System: 1I/ʻOumuamua in 2017, 2I/Borisov in 2019, and 3I/ATLAS in 2025. The prefix "1I" identifies the object as the first confirmed interstellar interloper, "2I" as the second, and so on…
Borisov approaches the ecliptic plane between the orbits of Jupiter (pink) and Mars (orange).
Black hole Messier 87
Esa hubble k 2 18a impression