The latest spectacle, observed by the James Webb Space Telescope, is an agglomeration of nearly 150 free-floating objects amid the Orion Nebula, not far in mass from Jupiter. Dozens of these worlds are even orbiting each other. The scientists who discovered them have called them Jupiter Mass Binary Objects, or JuMBOs, and the reason for their appearance is a complete mystery.

“There’s something wrong with either our understanding of planet formation, star formation — or both,” said Samuel Pearson, a scientist at the European Space Agency who worked on the observations that were shared on Monday, which have not yet been peer reviewed. “They shouldn’t exist.”