Nasa astronomers in California have found a planet in a multi-star system . 30 Ari b has four stars in its system - two sets of binary stars . All four stars would be visible from the planet , even in daylight . The planets orbit each other very closely and are tidally locked together with an orbital period that is about one Earth day ( or just under 24 hours ). Discovery suggests that 4 % of sun-like stars are in quadruple systems .
Nasa astronomers in California have found a planet in a multi-star system . 30 Ari b has four stars in its system - two sets of binary stars . All four stars would be visible from the planet , even in daylight . But its highly unlikely that the planet or any moons it has could host life . Discovery suggests that 4 % of sun-like stars are in quadruple systems .