Where are satellites and debris located? — The picture plots the apogee and perigee against the orbital period for all tracked objects in the orbiting the Earth, using 2018 data from the Joint Space Operations Center.

These types of plots, called “Gabbard diagrams”, are used to visualize the distribution of debris after fragmentation events (e.g. 1, 2). Clusters of points indicate objects with similar altitudes and velocities around the Earth.