3 ms·
On the other hand we haven't been able to establish a firm minimum amount of time from when Earth got oceans to when it got life. It took a long, long time to
by Symmetry 8y ago
On the other hand we haven't been able to establish a firm minimum amount of time from when Earth got oceans to when it got life. It took a long, long time to add photosynthesis to cemosynthesis, a long long time to create eukaryotes, and a long, long time to create multicellular life. I made a timeline:
http://hopefullyintersting.blogspot.com/2018/03/the-drake-equation-again.html http://hopefullyintersting.blogspot.com/2018/03/the-drake-eq...
Interplanetary pollution seems to happen pretty quickly compared to the history of life but I'm not sure we can say that it happens quickly compared to the start of life. Of course for all we know the reason Earth developed life so quickly was that it was seeded by the quicker-cooling Mars which had had Oceans before Earth did. More research is needed!
- interfixus 8y agoI would not presume to have any opinion on the direction such traffic might have taken. All I know is the one certain, observed fact in this case is that pieces of Mars have indeed fallen to the surface of Earth. There is of course no known reason why the reverse would not have happened. From your writings (added to feed, thank you) I notice we share a belief: That life may well be quite common out there, but human level intelligence exceedingly rare. I somehow believed this from a very young age, long before I ever heard of Drake or his equation or any such calculation.