Simeon Bird

In the first moments after the Big Bang, the universe was a hot soup of particles. Among them could have been neutrinos — very light and nearly elusive particles. Some of them might have been 'sterile': they barely interact with the rest of matter, like a quiet guest at a loud party.

The James Webb telescope discovered black holes — so named by John Wheeler, and Karl Schwarzschild described them as a light trap — which, just 500 million years after the Big Bang, already weighed more than a million Suns.