An interstellar trespasser known as 3I/ATLAS is almost certainly a comet. So, why do so many people think it's extraterrestrial technology?

I/Atlas isn’t sending messages. We explain the viral clip, the real radio detection from water chemistry, scientist responses, and its safe 170 million mile pass.

The latest trio — Zhang Lu, Wu Fei and Zhang Hongzhang — are the crew of the Shenzhou-21 mission, whose return capsule was taken home by the Shenzhou-20 crew following a potential space debris collision that rendered their original capsule inoperable.