Hottest and coldest habitable worlds...

This is a question that doesn't lend itself to precise formulation,
but consider the 'Golden Age' concepts of Venus and Mars, i.e. the
swampy jungle tropical Venus and desert-and-canals Mars. Both
fictional worlds are 'habitable' in that a human being can exist in
their surface environments without life-support equipment, s/he might
not be comfortable, but s/he can live, at least on some parts of the
surface.

(It might get too cold at night on Golden Mars, or there might be
parts of Golden Venus that are _too_ hot or high-pressure to survive,
but in each case there are parts of the surface where an unaided Human
can survive. There are spots on Earth where an unaided Human can't
survive, too.)

Certainly Golden Mars/Venus are gardenworlds compared to any real
planets in the Solar System except Earth.

So...in the real universe, just how much like Golden Venus could a
planet be before conditions ran away and turned it into something
resembling Real Venus? Likewise, how cold can an Earth-like world be
(and how globaly dry) before a survivable environment can't exist?

Another way to express this question: had conditions been different,
_could_ Golden Venus and/or Golden Mars have existed, under the laws
of nature as we know them? In some alternative history with the same
physics?

(We can vary the mass or other vital stats as long as we stay with
known phsyics and chemistry.)


Shermanlee

.

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