I have a bit of a problem with the following sentence: 여섯 번째 별은 다섯 번째의 가장 작은 별보다 열 배, 아니 그 이상 되는, 지금까지 본 오느 별보다 컸다. I understand it to mean, "The sixth star was ten times as big as the fifth and smallest star, and bigger than any star he had seen until then." But I don't understand the phrase 아니 그 이상 되는. Can someone explain it to me? Thanks for any help!