The five-star system is located 250 light-years away from Earth in the Ursa Major constellation. The stars all orbit on the same plane, indicating that they likely formed from the same proto-stellar disk of dust and gas. One pair of stars orbits so close together that it is called a contact binary, the BBC reports, and they may even share an atmosphere. The stars in the other binary are separated by almost 2 billion miles. Thirteen billion miles separate the two pairs of stars—a distance of more than four times the diameter of Neptune's orbit. After discovering the two binaries, the researchers detected some additional wavelengths of light that they couldn't account for, which led them to discover the fifth, lone star in this complex system.