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Thread: Modelling the space

  1. #1 Modelling the space 
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    Aug 2011
    Hi, I am new here, and a complete novice when it comes to astronomy, so sorry if my post seems to some of you not appropriate i.e. not elaborate enough, not enough advanced for this forum. I was just seeking a model of the Solar System that would appeal to my imagination and I think that I found it, and the outcome was a bit surprising to me. I wonder if somebody could follow my way of looking at the space and tell me if it is for him/her as surprising or inspiring as it seems to me or if it is quite obvious, or may be in some elements obviously erroneous. Thanks for any comments, Chaps!

    If we imagine the Earth, shrunk to the size of a typical school model of our globe (25 cm diameter, i.e. more or less the size of a basket ball) then the Moon will have nearly exactly the size of a typical tennis ball (6.8 cm diameter) but it should be placed at a distance of 7.5 m from the Earth-ball. Using the same scale, it would be impossible to show to the naked eye the size of the biggest man-made object on the orbit, that is the International Space Station, however, it should be placed just about 6.5 mm above the Earth-model. Of course, it should move, and if we decided to accelerate the time at the same ratio at which the distances were decreased (to avoid slowing down all motions), then 24 hours on hour model should last nearly 3 'normal' minutes and the ISS should make a full revolution around model-Earth every 10 s. Looking from the perspective of this model, all living beings on Earth would be sort of flatworms, as majority of them never go beyond the distance of 0.2 mm from model-Earth surface, roughly corresponding to the ceiling of big passenger planes. And how should we then present the Sun? It might be shown as an 8-storey building, at a distance of nearly 3 km from the model-Earth. I am not going to torture you with the data on all planets of our system, but Mercury would look in this model like a 9,6 cm large ball, moving around model-Sun at a distance of 1,1 km from it. To show the size of heliosphere the model should extend beyond the borders of some European countries, as the model heliosphere should have the radius of approx. 300 km. Presenting to the same scale the size of our Galaxy would not be possible at all on the Earth, as it (the model) should have the size of 18.5 milliard (US billion) km, compared to the real distance Earth-Sun of 150 million km. On top of this, Carl Sagan said (+/-) that we live in a world that contains uncomparably more galaxies than humans, and - we might add - some typical galaxies contain as many stars, as a human contains cells.
    Is it fascinating? intriguing or obvious or wrong?
    P.S. sorry for any misspellings.

    Last edited by Post_nacz; August 29th, 2011 at 05:45 AM. Reason: minor corrections (spelling etc.)
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  3. #2  
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    Now I see how trivial it seems. Thanks.

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