Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Ƙungiyoyin ƙwallon ƙwallon suna cikin tsofaffin abubuwa a cikin Milky Way, wanda hakan ya sanya ƙananan iyaka akan shekarun Milky Way. Za'a iya kimanta shekarun taurari daban-daban a cikin Milky Way ta hanyar auna yawan abubuwan da ke da rai na tsawon lokaci kamar thorium-232 da uranium-238, sa'an nan kuma kwatanta sakamakon da kimanta yawan asalin su, wata dabara da ake kira nucleocosmochronology. Waɗannan ƙimar fitarwa na kimanin shekaru 12.5 ± 3 biliyan don CS 31082-001 da 13.8 ± 4 biliyan shekaru don BD + 17 ° 3248. Da zarar an kafa farin dwarf, sai ya fara sanyaya radiation kuma yawan zafin jiki na farfajiyar ya sauka a hankali. Ta hanyar auna yanayin zafi na mafi sanyi daga cikin waɗannan fararen dwarfs da kuma kwatanta su da yanayin zafin jiki na farko da ake tsammani, za a iya kimanta shekarun. Tare da wannan fasaha, an kiyasta shekarun ƙwallon ƙwallon M4 a matsayin shekaru 12.7 ± 0.7 biliyan. Kimanin shekarun mafi tsufa daga cikin waɗannan tarin taurari yana ba da mafi kyawun kimantawa na shekaru biliyan 12.6, da kuma iyakar amincewa ta 95% na shekaru biliyan 16. A watan Nuwamba na 2018, masu binciken taurari sun ba da rahoton gano ɗaya daga cikin taurari mafi tsufa a sararin samaniya. Kimanin shekaru biliyan 13.5, 2MASS J18082002-5104378 B ƙaramin tauraro ne mai ƙarancin ƙarfe (UMP) wanda kusan gaba ɗaya ya kasance daga kayan da aka saki daga Babban Bang, kuma mai yiwuwa shine ɗayan farkon taurari. Gano tauraron a cikin Milky Way galaxy yana nuna cewa galaxy na iya zama aƙalla shekaru biliyan 3 fiye da yadda aka yi tsammani. An gano taurari da yawa a cikin Milky Way's halo tare da shekarun da aka auna sosai kusa da shekaru biliyan 13.80 na duniya. A shekara ta 2007, an kiyasta cewa tauraron da ke cikin galactic halo, HE 1523-0901, yana da kimanin shekaru biliyan 13.2. A matsayin mafi tsufa sanannen abu a cikin Milky Way a wancan lokacin, wannan ma'aunin ya sanya ƙananan iyaka akan shekarun Milky Way. An yi wannan kimantawa ta amfani da UV-Visual Echelle Spectrograph na Very Large Telescope don auna ƙarfin ƙarfin layin da ke haifar da kasancewar thorium da sauran abubuwan da aka halitta ta...  Tambaya: Shekaru nawa ne tauraron a HE 1523-0901?
Shekaru biliyan 13.2