ELI5: Explain Like I'm 5

Open cluster remnant

Imagine you have a big bowl of jelly beans. Inside that bowl, there are a bunch of different colors all mixed up. Now, imagine you take some of those jelly beans and put them in a smaller bowl. Those jelly beans are a group or a cluster just like stars in space.

Sometimes, those groups of stars in space are called open clusters. They are stars that formed together from the same cloud of gas and dust. But over time, those stars might move away from each other and it can be hard to find them all in one place.

When that happens, the cluster becomes a remnant. It's like the leftover jelly beans that didn't quite make it into the smaller bowl. The remnant is still made up of the same stars, but they are spread out and not as close together anymore.

So when we talk about an open cluster remnant, we are talking about a group of stars that used to be close together but have now spread out and are harder to find. Just like the leftover jelly beans are still yummy, the stars in the remnant are still important to science and can tell us a lot about how the universe formed.