Although dark matter's exact nature is still unknown, what we do know is that the amount of gravity in the universe is greater than the amount of visible matter that it corresponds to. This anomaly could be explained by some unseen source of extra mass, which provides the additional gravity that helps hold galaxies…
Dark matter almost certainly exists - otherwise, galaxy clusters wouldn't have sufficient gravity to hold themselves together. It was hoped dwarf galaxies could confirm the leading dark matter theories. But a new study has drawn a big, frustrating blank.
There's no reason at all why something as mysterious and cosmic should sync up with the changing of seasons on Earth...and yet now two independent sources claim that's exactly what it's doing. Just what is going on here?
Yesterday, we presented a comprehensive guide to the world of subatomic particles, exploring all the known elementary and composite particles. But now it's time to put certainty to one side and explore the wild, mind-bending world of undiscovered particles.