[ExI] kepler study says 8.8e9 earthlike planets

[John Clark]

On Wed, Nov 13, 2013 at 2:17 PM, Kelly Anderson <kellycoinguy at gmail.com>wrote:

> While fire is important to land animals, what makes it important is that
> it is terrestrial. [...] mining would be terribly difficult underwater, and
> especially in the very deep water worlds. How would they be able to pass
> through the bronze and iron ages in such a world?
>

Even if the underwater creatures could obtain copper and tin ore it would
do them no good if they didn't have fire and the necessary heat to refine
the ore into bronze. And making iron tools requires even more heat than
bronze, and steel more than iron.

> Imagine that cephalopods had another billion years of evolution without
> the interference of land returning to water animals
>

But they don't have another billion years, the sun will leave the main
sequence and the Earth will become uninhabitable in about half that time,

  John K Clark
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