Satellites and other objects falling from orbit into our atmosphere tend to burn up, but can that harm our atmospheres in ways we don't understand yet?

SpaceX completed a test flight of its Starship megarocket, following an aborted launch attempt last week in which several engines failed to ignite at liftoff. • The test flight, called Flight 13, hit key milestones before concluding with a controlled splashdown of the upper Starship spacecraft in the Indian Ocean.