[Telepathic Intruder]

Gravity would be a serious problem.

We would all need one of those motorized whatever-you-call-ems that almost ran me over a couple times at Walmart. Anyway, I'll bet most star systems have at least one planet in the habitable zone. The real problem is the right combination of conditions. Water, an atmosphere, a magnetic field, maybe even a large moon. Tidal forces were probably responsible for causing recombinations of amino acids resulting in the first self-replicating protein. There are probably a thousand other factors that make conditions for life such as ourselves extremely rare. Just finding a planet in a star's habitable zone means nothing in itself.

[hc87]

Plus:

i)plate tectonics (avoids the full globe resurfacing problem seen on Venus and an important part of magnetic field sustainability);

ii) low eccentricity orbit (i.e. mostly round);

iii) a Jupiter mass or larger companion to suck up rocks that would otherwise perpetually bombard the inner solar system;

iv) low variability in solar output; and

v) a quiet neighborhood where nothing big has gone supernova in the last billion years.

[Lazamataz]

It’s still Minshara-class.