Astronomers are closely monitoring interstellar object 3I/ATLAS as it approaches its perihelion on 29 October—a critical moment that could test the controversial “alien mothership” hypothesis.
Astronomers are preparing for a decisive test as interstellar object 3I/ATLAS reaches its perihelion on 29 October 2025, when it will pass behind the Sun. The comet—formally designated C/2025 P1 ...
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