Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Hanyar wucewa: Tsarin ka'idoji na ci gaban Rana ya nuna cewa shekaru biliyan 3.8 zuwa biliyan 2.5 da suka gabata, a lokacin Archean eon, Rana tana da haske kusan kashi 75% kamar yadda take a yau. Irin wannan tauraron mai rauni ba zai iya ci gaba da ruwa mai ruwa a farfajiyar duniya ba, sabili da haka rayuwa ba za ta iya bunkasa ba. Koyaya, rikodin ilimin ƙasa ya nuna cewa Duniya ta kasance a yanayin zafin jiki na yau da kullun a cikin tarihinta, kuma cewa duniya ta ɗan yi zafi fiye da yadda take a yau. Wani ka'ida tsakanin masana kimiyya shine cewa yanayin duniyar matasa ya ƙunshi yawancin iskar gas (kamar carbon dioxide, methane) fiye da yadda suke a yau, wanda ya kama isasshen zafi don rama ƙaramin adadin makamashin hasken rana da ya isa gare shi. Duk da haka, binciken da aka yi na Archaean sediments ya bayyana ba daidai ba ne tare da zaton da ake da shi na yawan iskar gas. Maimakon haka, za a iya bayyana yanayin zafin jiki mai sauƙi ta hanyar ƙaramin albedo na ƙasa wanda ya haifar da ƙaramin yanki na ƙasa da kuma "rashin ƙwayoyin girgije masu ƙarancin halitta". Wannan zai haifar da karuwar shan makamashin hasken rana, don haka ya biya diyya ga ƙananan samar da hasken rana.  Tambaya: A wane lokaci ne rana take haskakawa da kashi saba'in da biyar bisa ɗari na yadda take haskakawa a yau?
3.8 zuwa 2.5 biliyan shekaru da suka wuce