An oxygen atmosphere could be created and land masses formed.

"Then he was in an oxygen atmosphere when he went down."

This layer has an oxygen atmosphere with the temperature and pressure that makes it ideal for human life.

Indications are that it has an oxygen atmosphere and a lot of water.

In an oxygen atmosphere, methane is a sign of life.

Level C equipment does not offer the protection needed in an oxygen deficient atmosphere.

"I hope we can find a world with an oxygen atmosphere."

"It's got a breathable oxygen atmosphere," Bill said, thinking, it had better have or he wasn't going there.

One of its planets showed the blue of an oxygen atmosphere.

The pure oxygen atmosphere seemed to be affecting his ears.