A group of 60 ultra-faint stars around the Milky Way may be a new sort of galaxy.

A new satellite galaxy orbiting the Milky Way may be the most dark-matter-dominated dwarf galaxy yet identified or an ancient, soon-to-fragment clump of stars. 

The faintest and lightest satellite galaxy ever observed is a tiny, tightly packed clump of stars behind the Milky Way. 

A new class of unimaginably faint, dark-matter-dominated star systems may have been discovered. 

The newly discovered star system, tentatively designated Ursa Major III/Unions 1 (UMa3/U1), is 30,000 light-years from the sun. 

Our galaxy has at least 50 satellite galaxies, including this one. Even the smallest galaxies have thousands to billions of stars. 

In comparison, the new system has only 60 stars. According to a new analysis, its mass is 16 times the sun's. 

NASA estimates the Milky Way's mass at 1.5 trillion times our star's. 

The primary author, Simon Smith, a PhD student at the University of Victoria in Canada, said, "This discovery may challenge our understanding of galaxy formation and perhaps even the definition of a 'galaxy,'" "UMa3/U1 had escaped detection until now due to its extremely low luminosity." 

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