@yogthos This is by far the most badass periodic table out there

@yogthos What cosmic stuff do I have to smash together to get me some Technetium dammit 😡😡😡
@yogthos Wow, this is great. I didn't know white dwarves explode, or that merging neutron stars create new elements. I thought all elements came from either normal fusion inside a star or from supernovae.
@yogthos Or is this referring to a normal en.wikipedia.org/wiki/Nova ? Not literally a white dwarf exploding on its own, but one being fed enough hydrogen that it temporarily reignites fusion? (for one type of nova)

Re: merging neutron stars, TIL the word en.wikipedia.org/wiki/Kilonova

@clacke yeah I don't think white dwarves have enough mass for a nova, they're already a byproduct of a star shedding outer layers themselves as I recall. So, probably a dwarf getting fed by a companion.

@yogthos Yeah, from my understanding a white dwarf is just an inert hot cloud, just hanging there black-body-radiating until the end of time.
@yogthos Brown dwarves are just too small to ever have initiated hydrogen fusion. White dwarves have run out of hydrogen, are made of collapsed electron degenerate matter(1) and have residual heat(0) from back when they were fusioning away. But they're not *doing* anything, they're just sitting there.

(0) until they don't, but that takes such a long time that the first black dwarves (by a rather arbitrary definition, as it's a continuous scale) won't even start appearing until the universe is a hundred thousand times its current age, and that's the conservative estimate

(1) While I appreciate the plainness of the term "white dwarf", "electron star"(2) would have been much cooler. 😀

@clacke ah ok I misinterpreted the hot cloud part of the last comment. All this reminded me of a fun book I read a while back called Dragon's Egg, can recommend :)


(2) It's not just electrons, it's that electrons are there at all. This distinguishes them from neutron stars, or at least the core of neutron stars -- it's complicated, see Ethan Siegel's fascinating "How are neutron stars magnetic?" medium.com/starts-with-a-bang/… archive.is/1VF3z. Neutron stars also pretty much just hang around unless fed, but their structure and higher energy levels make them more interesting, and the article explains why something that sounds like it's just neutrons can be seen as pulsars (spoiler: not just neutrons).
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