On Thu, Nov 7, 2019 at 8:25 PM Lawrence Crowell <
[email protected]> wrote:
On Thursday, November 7, 2019 at 6:34:24 PM UTC-6, Brent wrote:
>
> * >> Wouldn't a small piece of a neutron star quickly explode via beta
>> decay?*
>>
>
> >I worked this out using the old liquid drop model. A baseball sized
> neutron sphere would have a surface gravity of around 10^{14}m/s^2, as I
> recall, which is enough to drag weak decay positron products back.
>
If its made of neutronium, Neutron Star stuff, it would have to be bigger
than a baseball. We're looking for something about 10 times the mass of the
Earth or about 6 *10^25 kg, neutronium has a density of about 4*10^17 kg
per cubic meter, so you'd need 150,000,000 cubic meters of neutronium, that
would be a sphere with a radius of 350 meters, nearly half a mile across.
That's much bigger than a baseball but not large enough to keep it stable,
the gravity would be too weak to provide enough pressure to keep it stable.
However planet 9 could be a "Stranglet", that is a body made of "Strange
Matter", a theorized form of matter made up of equal parts up, down and
strange quarks. If such a thing exists this hypothetical form of matter
would be even denser than neutronium and be stable even at zero pressure.
In fact it would be the most stable form of matter that there is, and that
means it would be just about the most dangerous thing there is. Strange
Matter, if it exists, would act as a catalyst and turn any ordinary matter
that comes into contact with it into more strange matter.
John K Clark
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