Tim Urban
@waitbutwhy · 1 mai 2022
At the center of our planet is a solid sphere of iron & nickel the size of India (1,500mi across) that's as hot as the surface of the sun, and its interaction w the molten iron surrounding it generates the magnetic field that keeps our atmosphere from blowing away.
pic: phys-org
Elon Musk
@elonmusk
By mass, Earth is composed of ~32% Iron. Next most common element by mass is oxygen at ~30%, but only a small portion of that is in the atmosphere.
01:12 · 2 mai 2022 · 0 vues
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