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The parent is saying that aliens (proteins from comets) may have brought life to Earth, but that is not an explanation for how life began in the first place, an
by cercatrova 4y ago
The parent is saying that aliens (proteins from comets) may have brought life to Earth, but that is not an explanation for how life began in the first place, anywhere in the universe. Saying "aliens" merely kicks the first-cause can down the road.
- webmaven 4y agoIt kicks the can down the road, but it also means that the "first cause" can be even less likely (on any one planet) and still have happened. In other words, if terrestrial life isn't assumed to have arisen on earth de-novo, then the odds of it arising elsewhere and being transplanted by chance rise considerably, as it only has to happen once on any one of many other worlds that are potentially suitable, and if we extend the thought to Earth perhaps not being a 2nd generation cradle to being a 3rd, or even at a further remove, the odds of life arising spontaneously somewhere start to look darnright favorable, and that is still assuming that we should only consider the emergence of terrestrial life-as-we-know-it rather than anything lifelike, with life-as-we-know-it simply being the one that emerged (or rather, spread) first, at least in our particular parochial corner of the universe.