What Elon Musk's 42,000 Starlink satellites could do for — and to — planet Earth

Over the next few decades, Elon Musk is hoping to send 42,000 Starlink satellites to space. With these satellites, SpaceX hopes to bring high-speed satellite internet to every corner of the world. But experts worry it may come at a hefty cost, blocking astronomers' views and potentially space exploration for decades.