Dark matter is one of the biggest puzzles in modern science.
Astronomers believe it makes up most of the mass in the universe.
Yet nobody has ever detected a dark matter particle directly.
The LUX-ZEPLIN experiment was built deep underground to hunt for these particles.
Recently the detector recorded a rare interaction that is difficult to explain as ordinary background noise.
What makes it interesting is that it appeared in the region where scientists expect dark matter to show up.
Even so, the team is being very careful.
They say they need much more data before they can claim a real discovery.