Dark Stars: Hypothetical Cradles of Supermassive Black Holes
In the first moments after the Big Bang, the universe may have given rise to objects unlike the familiar stars — dark stars.
How Neutrinos Flip in a Crowd
Toss a handful of coins on a table: each one lands heads or tails on its own. Now imagine the coins start flipping over, nudging each other. That's roughly how neutrinos behave in a very dense environment.