Recent content by snorkack

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    I Could one preserve polarized neutrons from decaying with a high B-field?

    I suspect it is not possible. It would be many more orders of magnitude, but not even that would work. p has NMR frequency of 1 GHz at 23,5 T. n´s gyromagnetic ratio is a bit under 70% that of proton Note that this under 700 MHz is the split both ways from the energy level in absence of field...
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    A planet with yearlong solar eclipse

    One example of a binary system is α Centauri. The 80 years orbital period straight inside your range of 70-100 years. At some point I figured out: if a planet of one of them orbits near the orbital plane of α Centauri AB, within a few degrees of it (likely, all solar system planets orbit inside...
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    Writing: Input Wanted Alien chiral chemistry

    "Why" might be "because they don´t produce much of them". But even if living enzymes did not produce or use wrong handed amino acids, some of them are formed by purely abiological racemization reactions from left handed enantiomers. If nobody at all ate or used them, they would build up. In...
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    Writing: Input Wanted Number of Androids on Spaceships

    Any comments about the likelyhood of carcinoids, or other therioids?
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    I Atmospheric escape parametre statistics

    What could be most sensible parametre for atmospheric escape excluding higher order (and nonlinear!) effects? Black body radiation is proportional to fourth power of temperature. Therefore temperature of black body is proportional to 4th root of incident radiation. Radiation from a point source...
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    I Where Are the Missing Black Holes in the Milky Way?

    So, what is the observed branching ratio of supernovae for results - neutron star, nothing, black hole?
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    I Where Are the Missing Black Holes in the Milky Way?

    Ask it this way: out of the 6 visible supernovae of last millennium, SN1054 formed a neutron star. What did the other 5 do? Can we name any black hole we observe as formed by a historic supernova?
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    A Atmospheric Density Required for Mercury´s Polar Regions to be Warm?

    No, there isn´t. Because of the 88 day nights. In the equatorial regions, the surface hears to +430C in the afternoon - and manages to cool to -160 Celsius by morning. At high latitudes where the Sun is low, daytime may only warm to +20, but night is still 88 days, so necessarily even colder...
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    I Where Are the Missing Black Holes in the Milky Way?

    But maybe it is easier to not bother deriving "progenitors"? Start straight from SN? In the last millennium, there have been 6 visible SN. 4 within Milky Way (1054, 1181, 1572, 1604 - note that 1006 is no longer in the last millennium!) and 2 without (1885 in Andromeda nebula and 1987 in Big...
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    Writing: Input Wanted Number of Androids on Spaceships

    Androids can physically operate as humans, but so can gynoids. Some automated systems can be "computers" physically affixed to the vehicle structure. An autopilot does not have to be android like Otto the autopilot. However, there are tasks which favour flexibility in mobility, handling diverse...
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    Writing: Input Wanted Number of Androids on Spaceships

    Do you think it likely that a ship might carry a number of carcinoids? And not like dr. Zoidberg who´s supposedly "decapod" and yet shows just four limbs and stands bipedal.
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    Admissions Why do Colleges Want "Well Rounded" Students?

    Well, the people who came up with "well rounded" in 1920s chose to define "well-rounded" in such a way as to be able to keep Jews out. Not a coincidence that these people also engaged in a witchhunt against professional athletes.
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    Admissions Why do Colleges Want "Well Rounded" Students?

    In order to keep out Jews, without explicitly saying so? Back in 19th...early 20th century, many elite colleges had exams based on academic criteria. The universities saw what they thought a problem - Jews were too smart and got too many places. So they moved the goalposts to be less transparent...
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    B Can this fusion cycle work in practice?

    The first reaction is also the prevalent fate of D in the world. But then the problem is keeping both the steps the main branch. From https://en.wikipedia.org/wiki/Deuterium_fusion the reaction 1) d+p=3He+γ is the prevalent fate of d not only in Sun (where d concentration is kept low by the...
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    I What are the Dynamics and Impacts of a Type II Supernova?

    Ah, thanks! Turns out that the daughters of Ni-56 are also resistant to just adding α when alternative for that α is more Ni-56: Co-56 8,695 Cu-60 8,666 Fe-56 8,790 Ni-60 8,781 Yet Fe-56 is not the most strongly bound nucleus, by that measure: Fe-58 8,792 Ni-62 8,794.
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