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If I understand correctly, Earth got very lucky with whatever massive planet ("Theia"?) crashed through in early formation to give us the huge core (hence magne
by ck2 3y ago
If I understand correctly, Earth got very lucky with whatever massive planet ("Theia"?) crashed through in early formation to give us the huge core (hence magnetic field for particle deflection) and our absolutely massive moon to churn things.
Seems like both might be needed for "life", maybe anything more than microbes?
Mars core is only half the size of earth's
- hinkley 3y agoThe latest density surveys of the earth’s core lead people to claim that chunks of Theia are still discernible in the mantle and outer core. There are splotchy chunks of higher density material down there. And by chunks I mean at least half the size of Australia to almost the size of Africa.
- codeflo 3y agoAfrica and Australia describe areas, and the word "chunks" implies volumes... I have no idea whether you mean to imply those chunks are very flat, or that they are in fact volumes with a diameter similar to the width of continents.
- s1artibartfast 3y agoThey probably are not 2 dimensional
- hinkley 3y agoTake your well achtually’s back to Reddit, dude. You have nested shells in a sphere. Like a couch on moving day, there are only so many shapes that will fit around a corner and still be substantial. If they weren’t substantial no reasonable person would call it a chunk the size of Africa. Or just google it.
- codeflo 3y ago> Take your well achtually’s back to Reddit, dude. I guess you're somehow convinced that such an infallibly good explainer that any question for clarification must come in bad faith. > Like a couch on moving day, there are only so many shapes that will fit around a corner and still be substantial. That defines the geometry perfectly, glad you explained it so clearly. > Or just google it. Yeah, why waste time reading your comments.
- hinkley 3y agoNo, I'm convinced that some people are blaming people commenting from their cellphone for not spoon feeding them the entire story when they could spend the same energy on extrapolating for themselves. This sort of learned helplessness didn't help you in school, and it certainly doesn't help you professionally. Also, "Whatever <move on to another topic that interests you more>" is a perfectly valid response. 90% of the time only narcissists care about ambivalence.
- ck2 3y agoThe simulation gives some insight, the debris was fed back by gravity in a swirl https://www.youtube.com/watch?v=kRlhlCWplqk https://www.youtube.com/watch?v=kRlhlCWplqk And always a great PBS Space Time on the subject https://www.youtube.com/watch?v=wnqPqV6DdFQ https://www.youtube.com/watch?v=wnqPqV6DdFQ
- hinkley 3y agoA rather dramatic answer to the question of why life on earth started 'recently'. I wonder how long it took that chaos to settle back down.