space

Old satellites and spent rocket stages keep piling up in orbit, and every collision scatters thousands of new fragments.

What name describes the runaway chain reaction in which orbital debris collisions create ever more debris?

Q: What name describes the runaway chain reaction in which orbital debris collisions create ever more debris?

Kessler syndrome. Named after NASA scientist Donald Kessler, who described it in 1978, the Kessler syndrome warns that a crowded orbit could turn into a self-sustaining cascade of collisions, potentially making some altitudes unusable for generations.

Kessler syndrome ✓
Roche limit
Lagrange effect

Kessler syndrome
Named after NASA scientist Donald Kessler, who described it in 1978, the Kessler syndrome warns that a crowded orbit could turn into a self-sustaining cascade of collisions, potentially making some altitudes unusable for generations.

Kessler syndrome describes a runaway cascade in which collisions between satellites and debris create ever more fragments, each capable of triggering further collisions, potentially rendering crowded orbital regions unusable for a very long time. It's named after NASA scientist Donald Kessler, who first outlined the risk in the late 1970s.

The Roche limit describes the distance at which a large body's gravity would tear apart a smaller object orbiting too close, relevant to things like planetary rings, not orbital debris. Lagrange effect isn't a standard term; Lagrange points are specific gravitational balance spots in space, unrelated to debris collisions cascading.

With tens of thousands of satellites now being launched by megaconstellations like Starlink, tracking and avoiding debris has become a routine daily task for space agencies, and even a single fragment as small as a paint chip can seriously damage a spacecraft at orbital speeds.

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