Study suggests every star likely has planets. - Page 3





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  1. #21
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    I think the concept that every star likely has planets is very cool, but there are still too many variables for determining the likelihood or numbers of other possible intelligent life.
    Including time: are they alive now, were they alive then but died out, are they yet to evolve?
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    Quote Originally Posted by El Mahdi View Post
    Of those 10 billion Earth sized planets, how many are in the "habitable" zone of their star...?

    And for that matter, how accurate is our assumption of what the "habitable" zone of a star is...? So far, that assumption is based on a sample of 1...
    Maybe you misunderstand the term. It isn't an assumption, it is a definition. "Habitable zone" isn't intended to mean, "the zone in which something we'd call life could exist". It is intended to mean, "the zone in which humans could live". Which, honestly, reduces to "the zone in which liquid water may exist on the surface for geologic/evolutionary timescales".

  • #23
    Quote Originally Posted by Kaodi View Post

    But also remember, detecting other intelligent life may not be limited to detecting radio signals. Perhaps the thought is that if you know what you are looking for, there may be other ways to figure out if a planet and its neighbourhood have been doing something unnatural...
    We'll know when the stars blink out 'cause the aliens have built Dyson spheres around them.
    "The Soul of D&D? It's rolling a natural 20 when you're down to 3 hit points and the cleric's on the floor and you're staring that sunnavabitch bugbear right in his bloodshot eye and holding the line just long enough to let the wizard unleash a fireball at the guards who are on their way, because they're all that stands between you, the Foozle and Glory." - WizarDru

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    Quote Originally Posted by Olgar Shiverstone View Post
    We'll know when the stars blink out 'cause the aliens have built Dyson spheres around them.
    given a certain distance from the sun, wouldn't the amount of matter needed to envelope the sun be greater than most solar systems have in entirety?

    Wouldn't that then produce some new wierd gravity distortion?

    Though the key idea is that we might be able to detect some super science event because it's bigger wierder than the rest of the universe's behaviors.

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    Quote Originally Posted by Umbran View Post
    Maybe you misunderstand the term. It isn't an assumption, it is a definition. "Habitable zone" isn't intended to mean, "the zone in which something we'd call life could exist". It is intended to mean, "the zone in which humans could live". Which, honestly, reduces to "the zone in which liquid water may exist on the surface for geologic/evolutionary timescales".
    Actually no. The last part about liquid water is correct, but not necessarily about Humans. It is about what we would call life. Life as we know it cannot exist without liquid water. But that definition is only due to our own observations. Observations which are limited to our own system. Which isn't even necessarily true here as there may be life under the ice of Europa or even other solar bodies well outside of what we consider our habitable zone.

    I think it's an assumption to state that life only occurs where liquid water is present. Just because it holds true so far, with the very limited exploration of our own system, does not mean that this will remain true. We won't know until we get out there.

  • #26
    Quote Originally Posted by Janx View Post
    given a certain distance from the sun, wouldn't the amount of matter needed to envelope the sun be greater than most solar systems have in entirety?

    Wouldn't that then produce some new wierd gravity distortion?

    Though the key idea is that we might be able to detect some super science event because it's bigger wierder than the rest of the universe's behaviors.
    Not really, no, since the sphere is the equivalent if infinitesimally thin compared to the scale it's on. We're not trying to fill the entire solar volume, just put a very thin shell around it. Plus it's gravitationally neutral since its center of mass remains the center of the primary.

    And if you have the tech to build a Dyson sphere, you certainly have the tech to take down not only your entire solar system (to include the large mass in the Oort cloud) but also raid nearby systems as well).
    "The Soul of D&D? It's rolling a natural 20 when you're down to 3 hit points and the cleric's on the floor and you're staring that sunnavabitch bugbear right in his bloodshot eye and holding the line just long enough to let the wizard unleash a fireball at the guards who are on their way, because they're all that stands between you, the Foozle and Glory." - WizarDru

  • #27
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    And if you have the tech to build a Dyson sphere, you certainly have the tech to take down not only your entire solar system (to include the large mass in the Oort cloud) but also raid nearby systems as well).
    I KNEW those cannister vacs we're good, but I had no idea!
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    Quote Originally Posted by Dannyalcatraz View Post
    I KNEW those cannister vacs we're good, but I had no idea!
    They're only good until someone switches them from suck to blow!

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