Scientists suspect that a “fifth force” may be at work in space. This force, which they believe is mediated by a hypothetical particle called a symmetron is responsible for creating invisible walls in space.

The walls aren’t necessarily like the walls of a room. Instead, they are more like barriers. And, they could help explain an intriguing part of space that has left astronomers scratching their heads for quite a while.

The Lambda cold dark matter (ΛCDM) model is the current standard model we use to explain cosmology. However, there’s been one perplexing challenge to this model, and sometimes it just doesn’t add up.

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According to that model, small galaxies should be distributed in messy orbits around larger galaxies. However, most small galaxies orbiting larger galaxies are arranged in thin flat planes. These planes, or disks, look similar to the rings of Saturn. Almost as if there is some invisible wall in space that the galaxies arrange along.

Read more: BGR