Life on Exoplanets In the paragraph dealing with life on exoplanets someone educated in the field of biology and development of life on earth should say something about the fact that for earth complex lifeforms emerged only after 4 billion years and chances are that conditions on any planet just take so much time too be just right for complex life to develop It certainly should be mentioned with this new hype regarding the new KOI superearth analog in the habitable zone No life will be there not even detectable oxygen in the atmosphere That took primitive life on earth something like 2 000 000 000 years