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| Interstellar comet 31/ATLAS as seen by the Hubble Space Telescope. © NASA/ESA/Hubble |
The astronomical community is abuzz with the recent observations of 3I/ATLAS, an interstellar comet that made its way into our solar system. Discovered on July 1st, this celestial wanderer has quickly become a subject of intense scientific interest. The iconic Hubble Space Telescope, a beacon of space exploration since its launch in 1990, has successfully captured stunning images of this rare visitor.
Although the comet's current luminosity is too low for casual observation by amateur astronomers, a compelling video compiled from Hubble's photographs has been shared on Bluesky by astrafoxen, an astrophysicist. Notably, visible streaks within these images are attributed to cosmic rays, a common phenomenon in deep-space photography.
Further analysis through spectroscopic examination of the comet's coma, published on July 20th, has yielded fascinating insights into its composition. Researchers found an abundance of water ice, along with characteristics akin to dark, silicate- and carbon-rich D-type asteroids. This composition distinguishes 3I/ATLAS from typical trans-Neptunian objects such as Pluto, highlighting its unique interstellar origin.
The initial sighting of this mysterious object occurred between June 21st and July 7th, when it was accidentally imaged by the Vera C. Rubin Observatory in Chile. 3I/ATLAS marks only the third interstellar visitor ever identified in our cosmic neighborhood. Despite its vast age, estimated to be around 7 billion years, and its journey from another star system, 3I/ATLAS poses no threat to Earth, making it an ideal candidate for extensive scientific study. The comet is expected to reach its perihelion passage on October 29, 2025.
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