How do you launch a satellite without risking running into one of these things on the way up? Do you have to calculate the trajectories of all of them individually?
Regarding launching and collisions: You mostly don't have to worry about it. The visualization makes space look crowded, but each satellite is over 150,000 times smaller than what is visualized. Space is very very big and very very empty. LEO is bigger than the surface of the earth and dozens of times thicker than the earth's crust.
It only takes a few radar stations to track all the satellites, and the US Space Force makes their data public.[1][2] Most satellites don't have much in the way of maneuvering capabilities, so you don't need continuous tracking, just updates every few days or so.
Yes they do know the trajectories so you put yours in a one where it should not hit anything. Most modern satellites also have engines so they can move on their orbit to dodge stuff if needed. Also remember that space is 3 dimensional so you can be at the same exact "spot" on this map but still be few kilometers apart.
Also this visualization is kind of misleading as it makes the satellites look way too big. In reality you could not even see them from even from the closest zoom available.
