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originally posted by: longy9999
Agreed, once again it all boils down to life as we know it. With a universe as vast (or possibly infinite) such as ours the possibilities for different types of life are endless, there could be life out there which is so different to what we know that we wouldn't even recognise it as life.
originally posted by: Ross 54
NASA scientists have been running a large number of computer simulations of possible exoplanet atmospheres. They now conclude that the detection of any one atmospheric gas is inadequate to establish the presence of life on a planet. Such gases may arise due to non-living processes. Combinations of certain gases, such as oxygen and methane will be necessary to be certain that extraterrestrial life has been discovered. Details are given in the article, linked below:
phys.org/news/2014-09-nasa-guideline-future-alien-life.html
originally posted by: longy9999
Agreed, once again it all boils down to life as we know it. With a universe as vast (or possibly infinite) such as ours the possibilities for different types of life are endless, there could be life out there which is so different to what we know that we wouldn't even recognise it as life.