A new paper suggests that the mysterious X17 subatomic particle is indicative of a fifth force of nature.
A new paper suggests that the mysterious X17 subatomic particle is indicative of a fifth force of nature.
Dark matter might well be the biggest mystery in the Universe. We know there’s something out there making things move faster than they should. But we don’t know what it is, and we sure as heck don’t know where it came from.