[andsoitis]

Meteors contain various heavy metals, primarily iron and nickel, which form metallic cores of asteroids and make up the bulk of many meteorites.

They also contain other siderophilic metals, including cobalt, chromium, gold, platinum, iridium, and tungsten. The high concentration of these metals, especially precious metals like gold and platinum, is due to their affinity for sinking to the core of early planets and asteroids, which are remnants of the primordial solar system.

[timschmidt]

Further, satellites like Starlink's are engineered to burn up on re-entry. Meaning that they are manufactured of materials known to combust at re-entry velocities in thicknesses and shapes appropriate to that end.