We originally wrote this paper nearly a year ago. As of last June, the CRASH Clock was at 5.5 days. It's now down to 2.5 days. It was 168 days in 2018, pre-Starlink.

It just keeps dropping as we launch more satellites into orbit.

This metric shows how completely dependent we are on continued perfect operations in orbit. 2/3 of all satellites today are Starlinks, and they performed 300,000 collision-avoidance maneuvers last year. They have done it perfectly so far. How long can that continue?