not_Fritz_Argelander

  1. DM status review

    by , 02-18-2017 at 07:13 PM
    Quote Originally Posted by not_Fritz_Argelander View Post
    https://arxiv.org/abs/1701.01840

    Over the past few decades, a consensus picture has emerged in which roughly a quarter of the universe consists of dark matter. I begin with a review of the observational evidence for the existence of dark matter: rotation curves of galaxies, gravitational lensing measurements, hot gas in clusters, galaxy formation, primordial nucleosynthesis and cosmic microwave background observations. Then I discuss a number of anomalous signals in a variety
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  2. was just joking, but now....

    by , 01-17-2017 at 02:01 AM
    Quote Originally Posted by j.gardavsky View Post
    Quote Originally Posted by ParkerM View Post
    Just to be sure, I already have a Baader solar film filter that gives me a white image when looking at the Sun, if I add a Baader Solar Continuity IR UV cut filter I can get more detail in my images? I have a 130 SLT if that makes any difference. After my first Solar viewing I was kind of disappointed with getting just a big white blob and researched into it only to find out I was way outta my budget range with some of the equipment I saw. Thanks in advance.
    Baader used to have an
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  3. was just joking, but now....

    by , 01-17-2017 at 01:59 AM
    Quote Originally Posted by Lowjiber View Post
    I have a 120mm (f/9) refractor permanently set up for solar observing and white light photography. I had Kendrick build a solar film (Baader) filter using a ring that uses three nylon screws as shown on this page...
    Solar Filters - Sun Finder, Baader Astro Solar Film and R-60 Aluminum Rings

    I've had no issues with movement of the filter, but can't argue with Thousand Oaks' logic of felt being better.

    Of the options you mentioned, I'd opt for the film version
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  4. the bullet cluster as evidence for modified gravity?

    by , 01-15-2017 at 04:46 AM
    Quote Originally Posted by not_Fritz_Argelander View Post
    In evaluating competing theories it is vitally important to avoid having one's personal emotions color the picture. Best is to take a humble posture of letting Nature tell us via experiment which alternatives are not-false.

    Dr H is feeling the despair of no lab evidence for DM even though only one of the alternatives has been searched for and even then not exhaustively. So there is no experimental justification for fatigue at no results for WIMPs. The parameter space for WIMPs has
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    Updated 02-18-2017 at 07:04 PM by not_Fritz_Argelander

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  5. was just joking, but now....

    by , 01-11-2017 at 12:40 PM
    Quote Originally Posted by not_Fritz_Argelander View Post
    in another thread i made a dry joke about discussing a mod to an Orion ST80 for solar observing. i had the upcoming eclipse in mind.

    so i buy the logic that thumb screws might not be as stable as friction fit full aperture filters. thus i'm thinking of a thousand oaks glass filter

    Solar Filters

    OR perhaps a Lunt Herschel wedge

    Lunt Solar 1.25" White Light Solar Wedge # LS1.25HW

    but not both

    and some
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