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Thread: Nasa Scientists Announce Discovery on new Solar System

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    Senior Member Lanky123's Avatar
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    Re: Nasa Scientists Announce Discovery on new Solar System

    Quote Originally Posted by Xlucine View Post
    http://www.space.com/35649-proxima-b...perflares.html
    No atmosphere is an impediment to the formation of oceans. These results are about a red dwarf star, rather than a cool white dwarf such as trappist-1, but I'd be surprised if similar processes were not occurring
    Low mass stars such as red dwarfs/brown dwarfs/ultra-cool dwarfs (wiki lists TRAPPIST-1 as a UCD - the differences are a bit arbitrary anyway) all tend to produce strong flares, so yes, the radiation stripping the atmosphere argument holds. Some stars are more active than others though, so you never know. Only way to know for sure is to wait for JWST to have a look in ~2019 or one of the 30-meter class telescopes with adaptive optics due online in the early 2020s.

    As I understand it the issue is not that we don't think there are Earth-like planets around Sun-like (i.e. more hospitable) stars. It's just harder to detect planets that are so much smaller than their host star. As such we're currently detecting rocky planets around small stars and Jupiter sized planets around larger stars. New telescopes should improve this as well as allowing a better analysis of the possible atmospheres of planets.

    * Pedantic point: White dwarfs are something different - rather than starting out as cool, low mass stars they begin as medium mass Sun-like stars. Once the hydrogen has been fused to helium they expand to red giants and then expel their outer layers to leave the core of the star as a white dwarf. Not a good place to look for planets as the red giant phase would have enveloped or at least fried them! We still have ~5 billion years left before the Sun reaches that point thankfully.

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    Re: Nasa Scientists Announce Discovery on new Solar System

    *trump becomes president*
    NASA: crap
    *a few weeks later*
    NASA: we've found 7 planets, 3 we can live on and there's enough room for everyone
    Stolen from twitter

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    Re: Nasa Scientists Announce Discovery on new Solar System

    Quote Originally Posted by Ttaskmaster View Post
    I think ultimately we are looking for advanced civilisations, to come and teach us stuff, give us technology and all that, though... We need a reason to come together over a common goal and start getting off this planet. As is, many of us struggle for a reason to even leave the house!
    Well, these particular surveys aren't. I don't think there is a lot of money in SETI style searches compared to more fundamental life. And frankly, it shouldn't be that hard to spot a species as advanced as ours, just listen out for their equivalent of Justin Bieber being broadcast. Which brings us firmly round to the Fermi Paradox: where the hell is everybody?

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    Evil Monkey! MrJim's Avatar
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    Re: Nasa Scientists Announce Discovery on new Solar System

    Quote Originally Posted by Dashers View Post
    Well, these particular surveys aren't. I don't think there is a lot of money in SETI style searches compared to more fundamental life. And frankly, it shouldn't be that hard to spot a species as advanced as ours, just listen out for their equivalent of Justin Bieber being broadcast. Which brings us firmly round to the Fermi Paradox: where the hell is everybody?
    Wait...the existence of Justin Bieber is evidence of an advanced civilisation???

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    Re: Nasa Scientists Announce Discovery on new Solar System

    Quote Originally Posted by Dashers View Post
    I don't think there is a lot of money in SETI style searches compared to more fundamental life.
    So why bother, right?
    If everyone only cared about how much money they could make from things, we'd never get anywhere.
    As is, we're getting nowhere fast.

    Quote Originally Posted by Dashers View Post
    And frankly, it shouldn't be that hard to spot a species as advanced as ours, just listen out for their equivalent of Justin Bieber being broadcast.
    I'm talking about more advanced, not more retarded.

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    Re: Nasa Scientists Announce Discovery on new Solar System

    Quote Originally Posted by Dashers View Post
    ... Which brings us firmly round to the Fermi Paradox ...
    Or the Fermi "Interesting Conversation Starter", as I like to call it There are way too many assumptions involved in any reasonable interpretation of the question to call it a paradox.

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    Re: Nasa Scientists Announce Discovery on new Solar System

    Quote Originally Posted by Dashers View Post
    I don't think there is a lot of money in SETI style searches compared to more fundamental life.
    There is some money in it these days.

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    Re: Nasa Scientists Announce Discovery on new Solar System

    Quote Originally Posted by scaryjim View Post
    Or the Fermi "Interesting Conversation Starter", as I like to call it There are way too many assumptions involved in any reasonable interpretation of the question to call it a paradox.
    Yeah, this. Between the great filter (i.e. the assumption that most societies destroy themselves), natural disasters, the fact that we occupy such a tiny sliver of time throughout the possible time-frame for existence of life, and for an even tinier sliver have we been able to observe or receive signals, the fact that we might not be able to perceive those signals, the fact that intelligent life doesn't necessarily want to communicate with other life-forms (e.g. out of fear), and the surprising number of things that have to happen before life arises (goldilocks zone, regular mixing of conditions due to tilting axis from another planet colliding with our own - see: Theia impact), the possibility that they have in fact observed us and don't like what they see - there are lots and lots of potential explanations for why we haven't been contacted by intelligent life. Is there now, or has there been, intelligent life capable of contacting us in some way? It seems likely, but that doesn't mean it's a paradox we haven't heard anything.

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    Re: Nasa Scientists Announce Discovery on new Solar System

    But these are not the nearest planets in the habitable zone. As far as I know the closest planet is near Proxima Centauri.

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