A team of astronomers have made an astonishing discovery — UMa3/U1 — the faintest star system ever observed orbiting our galaxy, the Milky Way.

Dubbed Ursa Major III / UNIONS 1 (UMa3/U1), it’s an incredibly dim and ancient group of stars located 30,000 light-years away in the constellation Ursa Major (which contains the Big Dipper).