From time to time, superhero comics lean hard on existing or new or speculative science to explain things in the story, and I was pleasantly surprised to read about dark matter as part of the ominous big bad in DC: Metal. Knowing what I do of dark matter, I felt like that was a big reveal. Kendra Saunders tries to hype it up in one speech balloon, but to lay out the sheer magnitude of the thing, I put some explanations down in this post:
http://rikdad.blogspot.com/2017/08/d...ultiverse.html
If people enjoy knowing the science behind their comics, I hope that does justice to it, and explains why Snyder may be foreshadowing that our Batman is going to face something a lot scarier than just one evil Batman from the Dark Multiverse.