There are currently around 27,000 items of human-made objects remaining tracked as they orbit Earth, but that only incorporates objects more substantial than a softball. If you contemplate all particles, that quantity is estimated to be closer to 100 million. This can be something from dead satellites still in orbit to parts of metal, screws or flecks of paint.
Impression: Why I am a place environmentalist — and why you ought to be, too
