How would alien life look like at all? Methane and oxygen would be an indication, perhaps even a living proof for extraterrestrial
Bio-astronomers assume that life affects the composition of the planet's atmosphere. On Earth, which is at least Sun It is therefore necessary to analyze the chemical composition of the atmosphere to distant planets. This is possible using spectroscopic methods. The existing in these compounds provide an atmosphere characteristic absorption of certain wavelengths, so that the resulting captured by a telescope light at certain wavelengths absorption lines.
These are like chemical fingerprints, which can be derived from, whether it is in the atmosphere of the planet as oxygen, water, methane or carbon dioxide.
This in turn can draw several conclusions. In the atmosphere of a lifeless planet, it can not be simultaneously increased concentrations of oxygen and methane - at least not for a long time.
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