[ceejayoz]

> The two examples you gave... Include liquid water.

This specific planet spends half its orbit in said zone. Here on Earth, we have creatures like https://en.wikipedia.org/wiki/Mudskipper that can survive severe dry spells, and fish that can happily freeze sold in ice for months.

Europa spends zero time in our solar system's "habitable zone", but because of its conditions, may still possess large amounts of liquid water. It's a perfect example of why the "zone" may be overly narrowly defined, even for Earth-like water-dependent life.

> It is entirely possible there is some other form of life that does not require liquid water, but we have yet to discover it.

And we certainly won't if we only look in Earth-defined "habitable" zones.