Probability of Being Hit by Falling Space Debris

The probability of any specific individual being struck by a piece of falling space debris is astronomically small, estimated at approximately 1 in 10 billion per year. However, the probability of space debris landing somewhere on Earth is quite high: hundreds of pieces of trackable debris re-enter Earth's atmosphere each year, with most burning up completely.

Despite tens of thousands of tracked objects in orbit and decades of space activity, only one person has ever been confirmed as being struck by space debris: Lottie Williams of Tulsa, Oklahoma, who was hit by a small piece of a Delta II rocket in 1997 and was uninjured. The vast majority of re-entering debris falls into oceans (which cover 71% of Earth's surface) or unpopulated land areas.

As the number of objects in orbit increases (especially with large satellite constellations like Starlink), the risk of debris reaching the ground may increase slightly. Space agencies attempt to guide large decommissioned objects toward controlled re-entry over unpopulated ocean areas. NASA and the Department of Defense actively track over 27,000 pieces of space debris larger than 10 cm.