The Possible Parallel Universe of Dark Matter
As researchers learn more about dark matter’s complexities, it seems possible that our galaxy lives on top of a shadow galaxy without us even knowing it.
I am a light-matter chauvinist. Don’t snicker; you’re probably one, too. Almost all of us are.
We think of ourselves, and the world immediately around us, as something special. And by extension we regard our kind of matter — atoms, molecules, rocks, water, air, stars and all of the other things that interact with visible light — as the most important kind of matter in the universe. The only matter that matters, as it were.