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 pic.twitter.com/xE4mEyMPlU
— Tim Urban (@waitbutwhy) May 1, 2022