Astronomers are looking for habitable planets in our neighbourhood. The understanding of our Planet’s history helps to determine the state of a remote planet by analysis of its light spectrum.
Is it just born or full of life? Are there intelligent lifeforms or is it an ice planet. NASA’s Astrobiology Magazine devides Earth’s development into seven epochs. Starting 4.5 billions ago with no oxygen, Planet’s atmosphere has changed dramatically until today.
Read on and find out how long it has taken to turn our Planet from an overheated greenhouse filled with methan and carbon dioxide into an habitable dwelling for multicellular life.
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