-1- wrote: ↑Sun Aug 19, 2018 5:01 am
Remarkable. An unknown radius of orbiting distance and unknown spin rate are inferior to the present.
I said different, not inferior. Our environment would be inferior to whatever evolved in that different environment.
You are making an invalid inference, by saying that the UNKNOWN would have prevented the evolution and life itself to develop on Earth.
No, I said the different environment (which is unknown) would have evolved different things, had life somehow started anyway. The prevention was because the super-low probability event would have to also happen in this different scenario. Most likely it wouldn't, just like it wouldn't in the scenario with the moon, but anything at all different. That's all under the micro-differences section, not the macro section you quoted.
I have not found an article that renders a guess as to the orientation of Theia event that made the moon. Without that knowledge, the length of Earth day and year before that event is unknown. They have suggestions for offset, speed and mass, but not orientation, which leaves no evidence. Another difference: Theia undoubtedly brought different chemicals to Earth. Without it, the chemical makeup would have been different, and thus any life that might have started would probably be poisoned in our environment just as the moles would be poisoned in that moonless environment.
I say that is possible, but it is also possible that the UNKNOWN conditions would have been equally favourable, which is also equally possible, as well as the conditions being hugely more favourable.
Fair chance that the no-moon Earth would have no water. Yes, it might be more favorable, but even our Earth is not at all favorable. Life is already a really low probability thing, and we just happened to hit it here, and not other trillions of places that are just as favorable.
We actually don't know how likely life is given ideal conditions. Yes, the event is far less likely than one in a trillion, but we got a lot more than a trillion attempts at it.
Since we deal with an UNKNOWN, you can't categorically declare its qualities for certain.
Parts of it are definitely different, such as the day length. A constant day length is different than a significantly lengthening one. But yes, the year length might possibly have been unchanged, although in that case there would have been some severe seasonal changes: Super hot and cold summers and winters due to a highly elliptical orbit. So again, unknown, but definitely very different. The only way to avoid these big seasonal changes is to have a big change to the length of the year.