Whakarāpopototia te tuhinga:  E whakapono ana ngā tohunga whetū kei te puta mai ngā tohu ngaro - i kiia i mua ko ngā pupuhi whetū - mai i tētahi aorangi rite ki te Ao. Ko te aorangi Gliese 581d he tikanga hei tautoko i te ora, a, ko te mea pea he ao toka, e rua nga wa te rahi o te Ao. I kitea tuatahihia ngā tohu mai i te aorangi i te tau 2010, engari i te tau kua hipa i kiia he haruru mai i ngā whetū tawhiti. Panuku ki raro mō te ataata. E whakapono ana ngā tohunga whetū ko ngā tohu ngaro a ngā 'iwi ke' - i kiia i mua ko ngā pupuhi whetū - e ahu mai ana i tētahi aorangi rite tonu ki te Ao. I kitea tuatahihia te aorangi Gliese 581d i te tau 2010 (whakaahua a te kaitoi) Inaianei, e kii ana tetahi atu rangahau i runga i te rangahau 2014 i runga i te 'arotake kore o nga raraunga' me te mea kei te noho tonu a Gliese 581d. I kitea te aorangi i te tau 2010. Koia te aorangi rite-ki-te-Ao tuatahi i kitea i roto i te rohe 'Goldilocks' huri noa i tētahi whetū. Engari i muri tata mai i te kitenga, ka kī tētahi rōpū pūtaiao ko ngā tohu i whakaarohia mai i tētahi aorangi, he mea māmā noa iho ngā pānga ā-maneta mai i ngā whetū. E kī ana te rangahau whakamutunga ko te rangahau i runga i ngā pakaru whetū i takea i runga i ngā "tātari hapa o ngā raraunga". I kī rātau he pai te tikanga mō ngā aorangi nunui, engari kāore e taea e te tikanga te kimi i ngā aorangi iti pērā ki a GJ 581d. I te tau kua hipa, i kii nga kairangahau o te Whare Wananga o Pennsylvania State ko Gliese 581d - me tana hoa Gliese 581g - he tinihanga noa iho o te marama i puta mai i nga pupuhi aorangi mai i te whetu o te rohe 22 tau-marama te tawhiti. Heoi anō, e tautohe ana te rangahau hou o Ingarangi, ko te tikanga i whakamahia e te rōpū Pennsylvania he pai anake mō ngā aorangi nunui, ā, ka taea e ia te ngaro i ngā mea iti pēnei i te GJ 581d. Ko te rangahau, na te Whare Wānanga o Kuini Meri, London me te Whare Wānanga o Hertfordshire, e kii ana ki te whakamahi i tetahi tauira tika ake i runga i nga raraunga o mua. "He mea nui te tīariatanga (kore rānei) o GJ 581d nā te mea ko ia te aorangi tuatahi rite ki te Earth i kitea i roto i te 'Goldilocks'-rohe huri noa i tētahi whetū, ā, he take whakatauranga mō te tikanga Doppler", te kī a te kaituhi matua, a Dr Guillem Anglada-Escudé. 'Kei te kōrerorero tonu ngā kaipūtaiao mō...
Kei roto a Gliese 581d i te rohe noho o te whetū, ā, ka pai pea mō te tangata. I kitea i te tau 2010, i whakakahoretia i muri mai he pupuhi whetu, ehara i te aorangi. Inaianei, e whakapono ana ngā kaipūtaiao ko ngā tātaritanga o mua i hāngai ki ngā raraunga hē. E ai ki a rātau kei te tīari te aorangi ā, ka taea pea te tūmanako ki te kimi i te oranga tangata ke.