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Interstellar comet 3I/ATLAS isn't an alien spacecraft, astronomers confirm. 'In the end, there were no surprises.'

Though this hunt came up empty, the fact that 3I/ATLAS is only the third known object found in the solar system after ...
Interesting Engineering

How nuclear propulsion shaped early interstellar vehicle design

The Space Age framed nuclear propulsion as a quiet rethinking of movement, distance, and endurance beyond Earth.