6 trends tracked about this subject — the full history, oldest to newest below.
Interstellar comet 3I/ATLAS provides rare chemical data from the frozen outskirts of an alien star system, according to recent astronomical studies.
A near-Earth object misidentified as an asteroid for 28 years has been revealed as a "dark comet" after passing within 2 million miles of Earth.
An object tracked as an asteroid since 1998 has been reclassified as a dark comet following an unexplained orbital shift.
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Astronomers report that the interstellar comet 3I/ATLAS may predate the Solar System, exhibiting unique chemical properties during its recent transit.
Astronomer Alan Hale, co-discoverer of the notable Comet Hale-Bopp, has died at age 68.