First natural satellite found outside the Solar System

In a groundbreaking discovery, scientists have identified the first natural satellite beyond our Solar System, an exosatellite orbiting a brown dwarf. While over 6,000 exoplanets have been cataloged outside our solar system, this marks the first detection of an exosatellite.

The finding, detailed in the journal Nature, was led by Chilean researchers utilizing observations from the European Southern Observatory's extremely large telescope. The celestial body is described as a gas giant roughly the size of Jupiter, completing an orbit around its brown dwarf host star approximately every 170 days.

Astrophysicist Alice Zurdo, a professor at the University Diego Portales and director of the research project, highlighted the significance of the discovery. "This milestone opens new challenges and questions for the scientific community to answer, such as when this satellite formed, why it exists, or how many more there are," Zurdo stated in an interview.

Researchers are still determining if the object can be definitively classified as an "exoluna," with Zurdo noting that "there is nothing comparable in the Solar System." This unprecedented discovery promises to reshape our understanding of planetary and satellite formation beyond our own cosmic neighborhood.