MarAzul
LongShip
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Some of the thoughts in the Pluto thread seem appropriate for another thread.
When you think about it just a little, we humans and most of the other creature here on Earth are rather tender little things. Not very strong and really have a very narrow environmental comfort zone.
Did we just find our niche when we pick earth as home? Did we just spring forth out the surface litter?
Or were we designed for our niche in the beginning? A list of many of the variable that must be quite right, does make our niche pretty darn rare. I am not sure we even know if it is not, simply unique.
Our planet has these qualities that we require;
The right size, so that the gravity is within our tolerance.
The right amount of spin so the one side is not over exposed to the suns heat
and the centrifugal forces are within our tolerances.
The right distance from our heat source of a size, that fills our needs.
A moon of the right size to work in tandem with the planet to move the oceans
just right for habitat and cleaning.
All the elements we require including carbon and water are here.
The atmosphere is not toxic to us now, but only since the planet has matured.
The atmosphere contain all the elements we require for us and our food sources.
Including Oxygen, Hydrogen, and carbon dioxide.
Contributed by Lanny
"The right amount of iron in our core to provide the poles of sufficient strength to ward off dangerous solar radiation. This happened because Gaia was struck by Theia at just the right angle to not only form our moon but also to provide iron and a spin that is just right. The term 'amazing' hardly does it justice."
This is indeed correct, without our Magnetic Shield, the Sun's Solar winds would strip away the Ozone lay which protects us for the Sun's ultraviolet light.
Contributed by Denny
The range of life on earth is compatible for all life, not dominated by an overwhelming predictor species.
Next contributor.
I suspect you guys can even add more, @crandc , perhaps even more yet.
but then, that would brings us even closer to unique.
I say, we were indeed designed for our niche. And this is why we find no others, even with the brightest seeking for centuries now.
What say you?
I thought spinning was part of gravity though. So mass is the only thing that matters for gravity? I thought space stationts spin to create artificial gravity? Or is that just the movies?
I mean, there's still "strong gravitational" force. As in gm1m2/r^2. In an awesome coincidence, the rotation of the earth is so balanced with the radius/mass of the earth such that a) you don't get tossed into space and b) you don't get smushed like a dime against the face of the earth (Like you would on, say, Jupiter).
Uh oh! thought of some more complications. Gravity only directly opposes the centrifugal force of the spinning at the equator where the force vectors are in the same plane. Move toward either pole, the centrifugal force becomes less aligned with gravity as that force become perpendicular to centrifugal force which weakens in as a function of the cosign of the latitude as the diameter decreases. So it is a good thing it is not equal, it's in the wrong plane. But we are only talking about forces of around .5 % of the gravity.
Dang! I wished you had not brought this up. @rasheedfan2005
When you think about it just a little, we humans and most of the other creature here on Earth are rather tender little things. Not very strong and really have a very narrow environmental comfort zone.
Did we just find our niche when we pick earth as home? Did we just spring forth out the surface litter?
Or were we designed for our niche in the beginning? A list of many of the variable that must be quite right, does make our niche pretty darn rare. I am not sure we even know if it is not, simply unique.
Our planet has these qualities that we require;
The right size, so that the gravity is within our tolerance.
The right amount of spin so the one side is not over exposed to the suns heat
and the centrifugal forces are within our tolerances.
The right distance from our heat source of a size, that fills our needs.
A moon of the right size to work in tandem with the planet to move the oceans
just right for habitat and cleaning.
All the elements we require including carbon and water are here.
The atmosphere is not toxic to us now, but only since the planet has matured.
The atmosphere contain all the elements we require for us and our food sources.
Including Oxygen, Hydrogen, and carbon dioxide.
Contributed by Lanny
"The right amount of iron in our core to provide the poles of sufficient strength to ward off dangerous solar radiation. This happened because Gaia was struck by Theia at just the right angle to not only form our moon but also to provide iron and a spin that is just right. The term 'amazing' hardly does it justice."
This is indeed correct, without our Magnetic Shield, the Sun's Solar winds would strip away the Ozone lay which protects us for the Sun's ultraviolet light.
Contributed by Denny
The range of life on earth is compatible for all life, not dominated by an overwhelming predictor species.
Next contributor.
I suspect you guys can even add more, @crandc , perhaps even more yet.
but then, that would brings us even closer to unique.
I say, we were indeed designed for our niche. And this is why we find no others, even with the brightest seeking for centuries now.
What say you?
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