From Viking to Perseverance, scientists have spent decades chasing chemical hints that could point to life beyond Earth.

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NASA's alien-hunting Europa Clipper spacecraft took seven hours of ultraviolet observations of interstellar comet 3I/ATLAS while both objects zoom toward Jupiter.

NASA on Wednesday released new images and data of Comet 3I/ATLAS, the rare interstellar object that set off weeks of speculation — and a full-blown online debate — over whether it could be an alien ...

NASA insists that 3I/ATLAS is a comet that is traveling faster than any other object in the solar system. 3I/ATLAS, an interstellar object, was observed by NASA in July 2025. Some scientists, like Avi ...