Scientists from Argentina’s National University of San Juan say they’ve discovered a “large scale structure” in a largely unseen part of the Milky Way galaxy, according to a new preprint paper published to the arXiv server late last month. It’s been submitted to the journal Astronomy and Astrophysics, but it has not yet been peer-reviewed.

To be clear, the structure here is not any kind of human-made object; Rather, it’s a newfound galaxy cluster that’s been hiding out behind the Milky Way. Given how hard it is to observe other objects through the Milky Way, it’s exciting that researchers were able to observe this galaxy cluster at all. What’s going on across the galaxy from us, and why is it such a mystery over there?

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We can start with a simple thought exercise. You exist on Earth and, therefore, are in some location, right? So, from where you live, what do you see beyond Earth? I’m not talking about the open sky above Earth in your location. Instead, imagine if you were able to see through the land and sea and magma to the other side.

Read more: Popular Mechanics