This has been my favorite episode for a long time. It hits all the right notes. Love the music. Original VFX all the way.
I'm not seeing a problem with "Yet Another 'Doomsday Machine' Thread."
In my head-canon, the antimatter deactivation and/or subspace interference render(s) photon torpedoes inoperable.
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1. There is a Wikipedia article on neutronium [https://en.wikipedia.org/wiki/Neutronium]. The usual caveats apply: this is for reference only as a jumping off point, I do not stand by the contents of the article, etc. The caveats are especially relevant, because not much is known about the real-world properties of neutronium, as it has never been studied.
That said, the article distinguishes neutronium from degenerate neutronium in neutron stars. Regular (non-degenerate) neutronium is theorized not to solidify at ordinary pressures, not to interact electrostatically with regular matter (so, e.g. to be difficult to hold in a container), and to have properties similar to the noble gasses.
In other words, the material that the planet killer is made of need not be exactly the same material that neutron stars are composed of.
2. In the Star Trek universe, there are elements not on our periodic chart, such as dilithium and dikironium. It's wide open that the planet killer neutronium might be some science fiction-y neutron crystal with one or more of these exotic elements as dopants to allow the neutrons collective to solidify and crystalize in a sub-degenerate and non-self-gravitating state with a long half-life; saying that its hull is pure neutronium might simply mean that the crystal is perfect or nearly enough.
I'm not seeing a problem with "Yet Another 'Doomsday Machine' Thread."

In my head-canon, the antimatter deactivation and/or subspace interference render(s) photon torpedoes inoperable.
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Two part reply to this.Okay - on the shape of the DDM - if it's made out of pretty much solid neutronium (is there such a thing?!?) there would have to be some very strong force-fields keeping it from collapsing.
1. There is a Wikipedia article on neutronium [https://en.wikipedia.org/wiki/Neutronium]. The usual caveats apply: this is for reference only as a jumping off point, I do not stand by the contents of the article, etc. The caveats are especially relevant, because not much is known about the real-world properties of neutronium, as it has never been studied.
That said, the article distinguishes neutronium from degenerate neutronium in neutron stars. Regular (non-degenerate) neutronium is theorized not to solidify at ordinary pressures, not to interact electrostatically with regular matter (so, e.g. to be difficult to hold in a container), and to have properties similar to the noble gasses.
In other words, the material that the planet killer is made of need not be exactly the same material that neutron stars are composed of.
2. In the Star Trek universe, there are elements not on our periodic chart, such as dilithium and dikironium. It's wide open that the planet killer neutronium might be some science fiction-y neutron crystal with one or more of these exotic elements as dopants to allow the neutrons collective to solidify and crystalize in a sub-degenerate and non-self-gravitating state with a long half-life; saying that its hull is pure neutronium might simply mean that the crystal is perfect or nearly enough.