First We could detect alien life with the help of spacecraft.
But this is only possible within our solar system. The probes are simply too slow to reach other stars in the foreseeable future.
Second We are sending clear messages and search (modulated radio signals)
The search has been running for years by SETI. The transmission occurs even completely unintentional, since we operate radio and television stations.
Third We have in the atmosphere of distant planet signatures of life after, so oxygen and ozone.
The result of living things (at least on Earth) is not typical composition of air by natural chemical processes. Theoriginal atmosphere of a planet is very rich in CO2. Is he alive, the composition of the air is gradually changing.It comes to more oxygen and consequently ozone.
But this is only possible within our solar system. The probes are simply too slow to reach other stars in the foreseeable future.
Second We are sending clear messages and search (modulated radio signals)
The search has been running for years by SETI. The transmission occurs even completely unintentional, since we operate radio and television stations.
Third We have in the atmosphere of distant planet signatures of life after, so oxygen and ozone.
The result of living things (at least on Earth) is not typical composition of air by natural chemical processes. Theoriginal atmosphere of a planet is very rich in CO2. Is he alive, the composition of the air is gradually changing.It comes to more oxygen and consequently ozone.
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