The super-Earth HD 3167b is close to orbiting within the stellar equatorial plane, while the mini-Neptune HD 3167c orbits above the poles of the host star, and the orbits of the two planets are nearly perpendicular (mutual inclination 102.3 degrees), according to a team of astronomers led by the Observatoire Astronomique de l’Universite de Geneve. An artist’s conception of a three-planet system. Image credit: Sci-News.com. HD 3167 is a bright...