Massive compact halo object

Have you ever heard of the word "halo"? It's like a ring that surrounds something right? Well, the galaxy we live in, the Milky Way, also has a big halo surrounding it. But this halo is different because it's made up of something called massive compact halo objects, or MACHOs for short.

Now, you might be wondering what MACHOs are. Well, they are just really big objects that are floating around in space, but they are so heavy that they aren't really planets or stars, they are more like chunks of matter. Some people think that MACHOs might be made up of things like black holes or dead stars.

Basically, scientists think that these MACHOs are helping to make up the dark matter that makes the galaxy's halo. Dark matter is just something that we can't see, but we know exists because of the way it affects the things we can see.

MACHOs might sound scary, but they are actually really important for understanding how galaxies work and what they are made of. And who knows, maybe one day we will be able to explore them and learn even more about our universe.