[Nevermark]

> Let's revisit this thread in 5000 years after humans have gone interstellar and see if we can't review some evidence of unconventional life forms.

That would be wonderful!

I have no doubt that different chemical foundations, and different environments will yield extreme differences in morphology.

The uncountable differences between humans and the octopus are a vivid example of how little aliens may resemble us.

It would be most interesting to know if life could evolve in oceans under planetary crusts, sunless rogue planets warmed by radioactive decay, in the extreme conditions around magnetars where chemistry takes on different rules, in thick rings or atmospheres around gas giants, or in methane or other non-water “oceans”.

Surely somewhere there are energy conserving hibernating “rocks” that we might be well surprised to discover are sentient!