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Thread: In our Milky Way, looking through that plane of our Galaxy, why isn't it warmer?

  1. #1 In our Milky Way, looking through that plane of our Galaxy, why isn't it warmer? 
    The Enchanter westwind's Avatar
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    Surely the Stars that we see in our Milky Way are not that far apart that they do not influence the space separating them? Temperature wise I mean? I hear how cold Space is. Not Freezing obviously, what is there to freeze? But the warming effect from all the Star Systems should enable the Galaxy to have a tolerably warmer temperature? It seems such a waste of Star Fuel if nothing is happening in a benificial way? Gravity itself might require preset operating conditions to functionin low density space.? westwind.


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    Moderator Moderator Janus's Avatar
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    Think about it. The Sun can only warm Pluto to 55° K (-218° C), and the closest star is almost 7000 times further away. So yes, the stars are far enough apart that they have almost zero effect on the space between them.


    "Men are apt to mistake the strength of their feelings for the strength of their argument.
    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone


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    The Enchanter westwind's Avatar
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    For Janus. I'm interested. And I'm not old in my mind. There is an interest in what I can learn from you here. In the Universe and our Galaxy with its Spiral Star System there must be situations where the mean distance between Stars ( Solar Systems ). is a lot closer than 7000 measurements? There are massive stars out there. Some of these stars maybe 1000 times as large as our Sun. Our Galaxy is only one type of Star Clusters, Spiral or cartwheel inthis instance. There are other forms of star clusters in our Galaxy, spherical, elliptical, who knows what conditions prevail where variations of Nuclear Fission is taking place with subsequent energy output.? Are we in a position Science wise to state that all space throughout the Universe is at roughly the same temperature? westwind.
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    Comet Dust Collector Moderator
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    It actually is warmer in the direction of the Milky Way center, by a few millionths of a degree.

    ANd yes we can confindentky state that, it has been measured to great precision by two space telescopes, with a 3rd mission underway refining it further.
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    Forum Bachelors Degree dmwyant's Avatar
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    If by Plane you mean looking at the galactic disk edge on it would seem to make sense however you have a vast disk-like spiral in a void. That is a large surface area for the heat to radiate from. I would think that a globular cluster would have a higher temperature. Also the denser the stellar system the higher its internal heat would be, or so I would think.
    Not all who wander are lost... Some of us just misplaced our destination.

    I would rather be a superb meteor, every atom of me in magnificent glow, than a sleepy and permanent planet. The proper function of a man is to live, not to exist.
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    Comet Dust Collector Moderator
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    Just as a side note, in globular clusters (which are small clusters surrounding galaxies) the stellar denisy can be up to 1000 stars per cubic parsec. That means, in the core of a cluster, instead of 3 stars within 4.3 light years of earth, there would be 10-15 thousand!!
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    The Enchanter westwind's Avatar
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    Thanks for your Postes MW & dmywant. All new information for me. And I am benefiting from all the hard yards and midnight oil that you have expended over the years. I can think clearer when the fires of my mind are being warmed by the correct burning wood. Yes, when I use the word Quote "" Plane "" end Quote, it normally means looking through the Galaxy Disc from the edge. A sight line running through the middle of the System. ( Towards the Centre Point, where some speculate there may be a Black Hole. ). I don't think so'. Reason being there would be more evidence of changed placement of some of our Galaxies, or at least more movement of our Galaxy, as perhaps in faster cartwheeling. It's hard to get my mind around all the Nuclear Fuel in our Galaxy, furnaces burning day and night, 24/7, forever and a day, and what for? At least our Sun is doing the right thing, warming our Planet to support Life. All these other fires in our Galaxy and only holding their own against the cold of interstellar space. westwind.
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    Comet Dust Collector Moderator
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    There is a black hole there. From this far away, gravitationally, a black hole has the same effect of a million stars in a small space. We know it's a black hole bacause of how small the space actually is... but gravitationally, it's the same. Sgr A* is the suspected location. In Sagittarius.
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    The Enchanter westwind's Avatar
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    For MeteorWayne. So no heat can escape the gravitational forces of a black hole? One might imagine a lot of heat contained within the System Dynamics of a Black Hole? westwind.
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    Forum Bachelors Degree dmwyant's Avatar
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    I know black holes emit X-rays and it is theorized that they may have "Hawking" radiation, asheat is a form of energy it could be that the energy is converted from a thermal radiation into X-ray radiation... Or I could be completely off my rocker which is known to happen this late at night
    Not all who wander are lost... Some of us just misplaced our destination.

    I would rather be a superb meteor, every atom of me in magnificent glow, than a sleepy and permanent planet. The proper function of a man is to live, not to exist.
    -Jack London
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  12. #11  
    Anti-Crank AlexG's Avatar
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    Quote Originally Posted by dmwyant View Post
    I know black holes emit X-rays and it is theorized that they may have "Hawking" radiation, asheat is a form of energy it could be that the energy is converted from a thermal radiation into X-ray radiation... Or I could be completely off my rocker which is known to happen this late at night
    Black holes do not emit x-rays. The x-rays are emitted by the swirling accretion disk of an active, rotating black hole. The accretion disk heats up as it spirals into the BH. It's from there, external to the BH that the x-rays are emitted.

    Hawking radiation does act as thermal radiation, giving the BH itself a very small temperature. (theoretically, as it's never actually been observed).
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