Tirohia te wāhanga i raro nei, kātahi ka whakautu i te pātai i muri mai i te reo kotahi me te wāhanga:  Passage: I te tau 2006 i whakamahia e tētahi rōpū kairangahau e Ralph von Frese rāua ko Laramie Potts ngā inenga taumahatanga e ngā amiorangi GRACE a NASA ki te kitea i te kohanga Wilkes Land 300-maero-whānui, tērā pea i hangaia i te 250 miriona tau ki muri.  Pātai: He aha te roa o te hanganga o ngā kōhao?
250 miriona tau ki muri.