I think all of you have heard about Starlink - the satellite system that is gradually covering the Earth and allows for decent internet even in remote corners of the world.
But not everyone knows that:
1) More than 3500 Starlink satellites have already been launched into space, with 12000 planned and a potential expansion to 42000.
2) They are visible from the ground.
3) Someday our grandchildren will ask, “Grandpa, tell me what it was like to look at the sky and see stars.” :)
Here you can see a simulation of what the sky will look like with 42,000 satellites https://twitter.com/hannorein/status/1471946104623276044
And here it explains how it basically works https://www.youtube.com/watch?v=QrI6aCGdB00