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ALIENS are surely AMONG US: Average star has TWO potentially Earth-like worlds


Our moon also gives help spin-stabilize us to stop the planet from flipping over. Mars seems to have changed axis by about 60degrees over the long term

Perhaps also very important for long term development:

- large magnetic field to keep ionizing radiation from the solar wind off

- large tides pushing movement of animals to the land

- active (but not too active) tectonic plates stopping the whole planet being covered in a shallow sea (great for dolphins, but not space-faring species)

-having massive outer planets (picking up some infalling comets)

-being at the edge of the galaxy (being far from nasties like gamma ray bursts and supernovae)

-not being in a dense cluster (interaction with other stars messing with planetary orbits)

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