Quote:
Originally Posted by FlamesAddiction
Here is a good video that talks about many of the rare circumstances that all had to come together to create and nurture life on Earth, and why looking for "Earth-like" planets is only a tiny fraction of the equation.
It touches on things people often don't think about like the Earth's magnetic field, tidal influences, the Earth's perfect axis tilt and the composition of the solar system.
It's completely possible a perfect combination of conditions could happen elsewhere, but I don't think we should assume it's common enough that we will ever find it.
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Earth is perfect for us but that doesn't mean other planets aren't perfect for it's inhabitants. We
are the product of our planet and it's environment, it's air, it's gravity and it's weather. Other creatures would evolve to there's.
But the four things mentioned are likely not that rare.
Magnetic fields - just about any spinning planet with size has one, we could use ours to be a little stronger actually
Tidal influences - Moons are common, like about 180 common in our own solar system, even Pluto has one
Earth's perfect axis tilt - without the tilt we might be better off weather wise, the poles would be far to cold, the equator would still be hot but there would also be areas in between with perfect steady temps.
Composition of our solar system - there may better ones, like one without the 150 million asteroids we hope to avoid in ours.
They have been saying it for years, the key is liquid water, find a planet that has it and life most certainly could evolve.