I find that theory fascinating, as well as the one where it would have to be carbon based like us because chemistry. (Silicon a distant second on supporting chemistry that a life form might need)
Then intelligent life would need to be land based because you can’t easily do things requiring heat without an oxygen atmosphere and something to burn (an octopus or porpoise might be intelligent but that’s a dead end without fire)
To be space faring, your planet couldn’t have much more gravity than earth, else chemical rockets wouldn’t work
At what point is it usefully generalizing on what any life form would need vs where are preconceptions limiting your thinking?
Thermal vents under water will keep you alive but it won’t be your energy source for industry. Also, how do you invent the steam engine under water on a thermal vent that cannot move around?
I find that theory fascinating, as well as the one where it would have to be carbon based like us because chemistry. (Silicon a distant second on supporting chemistry that a life form might need)
Then intelligent life would need to be land based because you can’t easily do things requiring heat without an oxygen atmosphere and something to burn (an octopus or porpoise might be intelligent but that’s a dead end without fire)
To be space faring, your planet couldn’t have much more gravity than earth, else chemical rockets wouldn’t work
At what point is it usefully generalizing on what any life form would need vs where are preconceptions limiting your thinking?
What about using heat from geothermal vents?
Thermal vents under water will keep you alive but it won’t be your energy source for industry. Also, how do you invent the steam engine under water on a thermal vent that cannot move around?