Orbital debris
Inactive artificial objects in orbit, most of which, too small to be tracked, remain invisible yet lethal to satellites.
Orbital debris is the inactive man-made material in orbit, spent rocket stages, dead satellites and collision fragments, that threatens active spacecraft. According to the European Space Agency's MASTER-8 statistical model, for the year 2025, there are around fifty-four thousand objects larger than ten centimeters, some nine thousand three hundred of them active satellites, and some one hundred and forty million fragments between one millimeter and one centimeter that current surveillance systems cannot detect. These invisible fragments are fully lethal, because they travel at a relative speed of around twenty-eight thousand kilometers per hour. This partial invisibility corrupts space-risk modeling at the root. The insurer has to estimate a collision probability from a population it cannot count and can only assume. Pricing becomes conjecture rather than measurement.
A shard of a few centimeters, too small to be tracked by radars, can destroy a satellite on impact, even though the insurer could not incorporate it into its collision model.
- ESA, Space Environment Report 2025, and proceedings of the 9th European Conference on Space Debris (SDC9, 2025), MASTER-8 model
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