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  1. My motorised focuser for Astromaster 130 (saved in case of site error)

    by , 11-07-2019 at 06:14 PM
    Quote Originally Posted by MarcinM View Post
    Hi there,

    After almost 10 years gap returned to hobby. I bought Celestron Astromaster 130, but after couple uses I decided it needs motorised focuser. It was really annoying when I tried to set focus and everything was shaking, vibrating etc from the slightest touch. So here it is, few words about it first.
    Initially I though about using two servos connected together, without batteries, but then stepper motor idea shown up. Had to design few parts using tinkercad (my first
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  2. Experiment suggests reality isn't objective

    by , 03-13-2019 at 03:21 PM
    Quote Originally Posted by not_Fritz_Argelander View Post
    Quote Originally Posted by not_Fritz_Argelander View Post
    Except for the fact that it's an experiment.... I'm finding it hilarious that the humans are picking the most metaphysical alternative as an explanation. Since the experiment depends on three assumptions (objective reality, free will, locality) there's a bias in making the interpretation about only the first.
    Slight elaboration.

    Free will is the shakiest of the three assumptions. It is least subject to experimental test since the subjective sense of free will is rather
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  3. Experiment suggests reality isn't objective

    by , 03-13-2019 at 03:39 AM
    Quote Originally Posted by not_Fritz_Argelander View Post
    I think that the original MIT Technology Review article deserves a posted link so that one can get closer to the horse's mouth, this is an important issue.

    https://www.technologyreview.com/s/6...ctive-reality/

    In other words, the experiment suggests that one or more of the assumptions—the idea that there is a reality we can agree on, the idea that we have freedom of choice, or the idea of locality—must be
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  4. Dr H on the status of inflation

    by , 03-09-2019 at 08:20 PM
    Quote Originally Posted by not_Fritz_Argelander View Post
    Let me add a little clarification. On rereading the post this addition might be needed.....

    Quote Originally Posted by not_Fritz_Argelander View Post

    The key insight is that the fraction of the universe that is in dark matter has different dependencies on the DM particle interaction cross section and mass.

    In the Standard Cosmology (inflation) the interaction cross section is fixed and independent of the DM particle mass. So the interaction cross section is fixed and independent of DM particle mass.
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  5. Dr H on the status of inflation

    by , 03-09-2019 at 07:17 PM
    Quote Originally Posted by not_Fritz_Argelander View Post
    Quote Originally Posted by not_Fritz_Argelander View Post
    PS To clarify..... A "plain vanilla" Big Bang is falsified by CMB uniformity and flatness so a Big Bang model with inflation survives the tests. One can also have CMB uniformity and flatness in a Big Bounce cosmology. The Big Bounce is also testable as described in this technical treatment.

    https://www.researchgate.net/publica...A_Brief_Review

    The tests involve measuring DM mass and interaction
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