The new James Webb Space Telescope discovered distant galaxies deemed "universe breakers" that experts are saying should not exist.

Galaxies as large as the Milky Way and filled with mature red stars were revealed by the telescope, according to a report.

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The nature of the galaxies is puzzling scientists, who have not been able to determine how they were formed.

Given the distance between the telescope and the galaxies, astronomers only realized they had something when they examined the light originating from small red dots in the photos from the telescope.

They were looking at light originating from approximately 500 to 700 years following the Big Bang, the report noted.

"While most galaxies in this era are still small and only gradually growing larger over time," Ivo Labbe, a researcher with Australia's Swinburne University of Technology, said. "There are a few monsters that fast-track to maturity. Why this is the case or how this would work is unknown."

The maturity and size of these galaxies had Labbe and his team believing there had been a mistake.

"The revelation that massive galaxy formation began extremely early in the history of the universe upends what many of us had thought was settled science," Joel Leja of Pennsylvania State University said. "It turns out we found something so unexpected it actually creates problems for science. It calls the whole picture of early galaxy formation into question."

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Leja deemed the galaxies "universe breakers."