Cascades to Coast

When Earth runs out of air, is there another planet with a similar context of air?

Scientists are very interested in finding an earth-like planet outside our solar system. Scientists have defined a "Goldilocks" zone - the orbital distance from a sun where the temperature is not too hot or too cold so that liquid water can exist. NASA scientists have found several planets in our galaxy that are in the Goldilocks zone, but we do not know what their atmospheres are made of - yet.