Lifestream, Diigo: SETI Scientist: Aliens Are Likely Robotic Life-Forms

SETI astronomer Shrostak suggests that alien lifeforms are likely to be sentient machines. By extension, if humans were able to transfer their minds/other essential human components to machines (becoming sentient machines), the potential to inhabit planets which do not support human biological requirements is advanced.
Looked at from a different angle, the notion of sentient machine extraterrestrials adds another layer of grey to the application of human rights. Of course, aliens, not being human, would not be entitled to ‘human’ rights. But if humans were to become sentient machines, our definition of ‘human’ would change. Would our rights then extend to all other sentient beings, regardless of their ‘shell’/housing/casing?
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