What is Hot dark matter?

Hot dark matter is like invisible, fast-moving ghosts that float through space and help shape our universe.

Imagine you're playing tag at the park, but instead of kids running around you, there are ghosts, invisible and super-fast. These ghosts don’t touch you or play with you, but they’re always moving, and their movement helps make things happen in the universe, like how galaxies form.

Hot dark matter is made up of tiny particles called neutrinos, which are so light and fast that they zoom through space like a bullet. They don’t stick together or slow down much, unlike some other invisible things we’ve discovered. Think of them as the speediest kids on the playground who never stop running.

Even though these ghostly neutrinos can't be seen or touched, their movement affects how galaxies and stars come together in space. It's like having a group of invisible runners helping to organize a big game, without them, everything would feel a bit more chaotic!

So, hot dark matter is just one part of the big, invisible puzzle that makes our universe work.