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View Poll Results: Is it?

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  • Yay

    21 26.58%
  • Nay

    58 73.42%
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Results 41 to 50 of 57

  1. #41
    Senior Member ItsAGuy's Avatar
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    Quote Originally Posted by runvardh View Post
    It's an absolute value he's using, doesn't matter closer or further away.

    By the way, the eccentricity of the Earth's orbit is around 1.7%; which means, annually, our distance changes by about 3.4% - I'm still breathing and taking hot showers...
    Right right; in fact, due to the tilt of our procession right now, the earth is actually closer to the sun during the north's far more bitter winters, and further from the sun during the north's far more searing summers... the distance to the sun IS important, but so is the amount of ocean, the circulation of water within the ocean, the thickness and composition of the atmosphere, how hot the core and mantle still are and the strength of the magnetic field. In fact, the mantle is largely the deciding factor right now because it's circulation helps recirculate the atmosphere and reintroduce fresh carbon dioxide (among other things, via volcanoes). Further, we rely quite a lot on internal heat.

    But, as the mantle continues to cool, the crust will eventually stop moving (though a few magma pipes will still reach the surface, similar to the end times on mars that led to artifacts like olympus mons), water will become permanently trapped beneath a surface that becomes ever more dry and cold, sporting a thinner and thinner atmosphere that has dwindling amounts of water vapor and carbon dioxide (both of which are greenhouse gases.) As these processes kill off life [as we know it], plants will no longer be able to produce oxygen (at least in useful quantities), thus further thinning the atmosphere (and the thinner it gets the colder). That, and what oxygen remains will rabidly bond (oxidize) with the soil, disappearing largely forever.

    In other words, Earth is already heading down the path to become another, fatter, Mars. By the time it reaches this status, Earth won't be very much warmer than Mars is now, regardless of its distance from the sun.

    Internal heat + External Heat + Atmospheric Recycling (geogenic and biogenic) + Magnetosphere to protect the atmosphere... we can't live here if any one of these disappears.

    Conversely, there are places in this solar system that may be good habitats right up till the sun sheds its skin... i.e., beneath the surfaces of 3 out of 4 gallilean moons. Due to kneading by the gravity of Jupiter, their cores will remain hot for far longer than Earth will with the assistance of the ever-distancing Moon. Being beneath the surface would also help shield settlers from Joop's radiation. Hell... in a billion years, we might have to consider pushing jupiter inward a little bit (not early to where we are now, but closer), and then pushing earth and mars into orbit around it. Hell, venus too. The fresh tectonic strain may help resurrect Mars' core, and keep ours from failing... meaning both of which could potentially be warm enough from within to make up for the extra distance from the sun.

    I'm sure, by then, we'll have figured out how to do all this. =)
    Last edited by ItsAGuy; 08-22-2010 at 11:34 AM. Reason: typo awards
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  2. #42
    Senior Member Stevo's Avatar
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    Not really.

  3. #43
    Senior Member guesswho's Avatar
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    Our sun holds a very special place in my heart.

  4. #44
    Senior Member paradox fox's Avatar
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    Nay: The star itself, not special. The system of planets it supports, extraordinarily special.
    Just because I'm an INFP doesn't mean I'm emo!

  5. #45
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    ^ Yep and if all goes well, the sun will behave and we'll all live to see 2013.



  6. #46
    Senior Member Coco's Avatar
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    Quote Originally Posted by tenINsFJ View Post
    Of course our sun is special.

    It's the perfect size and distance away from us. 2% in distance either towards or away from the sun and we are deaddddd
    Of course, because we evolved to live in this condition.
    If we lived on Venus, then we would have some kind of big heat protection.

  7. #47
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    Sol is special to us, but it seems relatively average in the grand scheme of things. I suppose it is in a single star system and many stars are in binary or multiple systems.

    VY Canis Majoris is more special.

    Heres a diagram in order of left to right. Sol, the Pistol Star, Rho Cassiopeiae, Betelgeuse, VY Canis Majoris

    Red is the orbit of Jupiter, blue is the orbit of Neptune (for scale)


  8. #48
    Senior Member LunarMoon's Avatar
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    Quote Originally Posted by tenINsFJ View Post
    Of course our sun is special.

    It's the perfect size and distance away from us. 2% in distance either towards or away from the sun and we are deaddddd
    Quote Originally Posted by GemPOPGem View Post
    But of course. Without it there would not be life on Earth. We are as yet to see another solar system which harbours a planet as our own. It could be argued that it is the whole of our solar system which is unique but it would not detract from our sun being special.
    We don’t have any hard data on how many stars are under that same condition as our own, though statistical probability would predict a lot of them. So many that most astronomists don’t even entertain the possibility that our universe is bereft of life. It's similar to type rarity; sure INFJs may make up less than 2% of the population but when you factor it against a species of 8 billion, it's really quite a few overall.
    Surgeons replace one of your neurons with a microchip that duplicates its input-output functions. You feel and behave exactly as before. Then they replace a second one, and a third one, and so on, until more and more of your brain becomes silicon. Since each microchip does exactly what the neuron did, your behavior and memory never change. Do you even notice the difference? Does it feel like dying? Is some other conscious entity moving in with you?
    -Steven Pinker on the Ship of Theseus Paradox

  9. #49
    The Eighth Colour Octarine's Avatar
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    Our part of the galaxy has an unusually large (very rare) amount of oxygen and other heavy elements. Apart from that, it's pretty ordinary.

  10. #50
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    It definitely isn't. It just so happened that one of its planets (Earth) happened to have the properties required for life to evolve.

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