Ask Ethan: Could “heavy light” be the missing dark matter? Our Universe requires dark matter in order to make sense of things, astrophysically. Could massive photons do the trick? When it comes to the Universe, there are some things we can be confident are out there based on what we observe. We know that the Universe was hotter, denser, and…

https://medium.com/starts-with-a-bang/ask-ethan-could-heavy-light-be-the-missing-dark-matter-f8beefa96cc3