Big Sky, When the Emu Left the Earth is an exquisite conversation of sky knowledge between Aboriginal farmer and award-winning writer Bruce Pascoe and astrophysicist Professor Ray Norris. This meeting of science and philosophy, tempered by holistic knowledge gained from deep observation over a millennia, offers a philosophy of peace for our age. It reframes astronomy not only as a science but as ethics and Law in our heavens. This dialogue places First Nations beliefs as rigorous, enduring knowledge, offering ecological and astronomical insights which could help navigate current climate threats. From Magabala's First Nations, First Knowledges series.