These planets would wish to lie inside the “habitable zone” in their star, the place temperatures allow for liquid h2o around the surface area. Priestley, on the other hand, named oxygen "dephlogisticated air", and did not identify it as being a chemical factor. The identify oxygen was coined in 1777 https://oxygen-chamber-cost51627.thechapblog.com/35099780/the-basic-principles-of-oxygen-therapy-cost-uk