Earth’s modern atmosphere is highly oxygenated and is a remotely detectable signal of its surface biosphere. However, the lifespan of oxygen-based biosignatures in Earth’s atmosphere remains uncertain, particularly for the distant future. Here we use a
10. The method according to claim 1, characterized in that said step (1.6) of the ion-plasmous deposition comprises: (a) depositing a scandium layer in the argon atmosphere, (b) depositing a titanium layer in the argon atmosphere, (c) depositing and implanting a layer of nitrogen solid...