Three new planets – being called “super-Earths” – have been found orbiting the star HD 40307 and are more massive than the Earth but less massive than Uranus and Neptune (which are about 15 Earth masses).
Three new planets – being called “super-Earths” – have been found orbiting the star HD 40307 and are more massive than the Earth but less massive than Uranus and Neptune (which are about 15 Earth masses).