 In stark contrast to the inner planets, c has an eccentric orbit (e = 0.36) lasting over 580 days within the habitable zone of its host star.The high eccentricity can't be explained by the inward migration of WASP-47b, and there isn't any secondary star to cause it.The only likely remaining explanation is that another massive planet altered the orbit of WASP-47c that is either further out in the system or was ejected billions of years ago.