Moon-forming impactor as a source of Earth's basal mantle anomalies

It's interesting that the LLVPs are beneath mineral rich parts of the world. One of the blobs is under Africa and the other is beneath the Clarion-Clipperton Zone. Is it possible that these extra-terrestrial impactors also affected the mineral content of the crust, not just the mantle?

> How unusual are we in the universe?

In time possibly much more unusual and rare than in all of space-time, and given that the sun is a second generation star unless conditions are much better than they were here on Earth it may take a lot longer for (intelligent) life to develop than here. We may be 'early'.

So 'right now' we are probably rare in the sense that we are a space faring species that hasn't (yet) destroyed itself and that may happen only rarely, so rarely that there is never much or even any overlap in time between two species at that stage of development (or say, even the last 500 years or so if you want a larger window). That's 500 years to overlap across an extremely large population of stars and planets so it may happen but it is still a small chance.

But if you let go of the time requirement then I don't think it is all that rare for it to have happened multiple times.

Let me give one example of how important the Moon is: without the moon the tides would be very weak (just solar tides) and that would mean that there is no part of the world where aquatic life can easily evolve into amphibious life (no tides: no tide pools, so no half-way-house between land and water). It may still have happened but much slower.

Some interesting reading on this:

https://www.smithsonianmag.com/smart-news/australian-lungfis...

We don’t know. We used to think it was critical because we thought life evolved in tide pools. Obviously no tide, no tide pools. That might be true, but now there’s good reason to believe that life started first in the deep depths of the ocean at magma vents. If that’s the case, maybe the moon isn’t essential.

The moon did shield us from many impacts however. All those massive craters were rocks that would have hit earth.

an interesting, albeit unsatisfactory solution to the Fermi parodox would be that we are a rare anomaly of a distant moon of comparable but lesser mass to the primary body, located in the inner solar system, but without tidal locking.

The latter two points might turn out to be extremely rare events.

RE: - How unusual are we in the universe?

To me this question is in answer to the Fermi paradox, the great filter .. is it behind us? Its important to answer because if its not behind us, then; not wanting to be hyperbolic but, we are about to end.

Apparently most of the computer models of the early solar system doesn't result in rocky planets this close to the sun. And when it does there are constant meteor strikes. So we could be quite improbable. However considering the size and age of the universe, if the filter is behind us in the form of improbability, it should look to us as something that is impossible.

> - How unusual are we in the universe?

If a tree falls on a planet 15 billion light years from Earth, does it matter to us? I think what really matters is how unusual are we in our galaxy and its neighbors.