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Interstellar Comet 3I/ATLAS Prompts First-Ever Planetary Defense Drill

3I/ATLAS, the third interstellar comet detected, exhibits a sunward-pointing tail and nickel-only composition, losing 2 million tons of mass before its Oct. 29 perihelion, scientists report.

  • 3I/ATLAS, the third interstellar object, is on the far side of the sun and will reach perihelion in late October 2025, according to IAWN observations.
  • Spectrographs at Keck II and the European Very Large Telescope reveal intense nickel emissions without iron, with nickel bound to carbon and oxygen in a compound linked to industrial Earth processes.
  • Aug. 2 images from the Two-meter Twin Telescope at Teide Observatory show a composite of 159 exposures revealing a fan-shaped, sunward-pointing jet roughly 6,200 miles long.
  • A small group of researchers argues 3I/ATLAS might be artificial, but most scientists dispute this, while the International Asteroid Warning Network coordinates global monitoring amid NASA shutdown limits.
  • Currently on the far side of the Sun, the comet will become visible in mid-November and December, as Avi Loeb calculates more than 33 gigawatts of solar power at perihelion caused around 2 million tons mass loss.
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NASA (Source) broke the news in Washington, United States on Wednesday, July 2, 2025.
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