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The Kessler syndrome, also known as the Kessler effect, collisional cascading, or ablation cascade, is a scenario proposed by NASA scientists Donald J. Kessler and Burton G. Cour-Palais in 1978. It describes a situation in which the density of objects in low Earth orbit (LEO) becomes so high due to space pollution that collisions between these objects cascade, exponentially increasing the amount of space debris over time. This proliferation of debris poses significant risks to satellites, space missions, and the International Space Station, potentially rendering certain orbital regions unusable and threatening the sustainability of space activities for many generations. In 2009, Kessler wrote that modeling results indicated the debris environment had already become unstable, meaning that efforts to achieve a growth-free small debris environment by eliminating past debris sources would likely fail because fragments from future collisions would accumulate faster than atmospheric drag could remove them.

History

NORAD, Gabbard and Kessler

Willy Ley predicted in 1960 that "In time, a number of such accidentally too-lucky shots will accumulate in space and will have to be removed when the era of manned space flight arrives". After the launch of Sputnik 1 in 1957, the US North American Aerospace Defense Command (NORAD) began compiling a database (the Space Object Catalog) of all known rocket launches and objects reaching orbit: satellites, protective shields, and upper- and lower-stage booster rockets.

Debris generation and destruction

Every satellite, space probe, and crewed mission has the potential to produce space debris. The theoretical cascading Kessler syndrome becomes more likely as satellites in orbit increase in number. In 2025 the number was estimated at over 11,800, most of which (7,135) belonged to Starlink, the constellation of SpaceX. As of 2021, it was estimated that there were 600,000 pieces of space junk ranging from 1 to 10 cm (1⁄2 to 4 in), and 23,000 larger than that.

Implications

The Kessler syndrome is troublesome because of the domino effect and feedback runaway wherein impacts between objects of sizable mass spall off debris from the force of the collision.

Avoidance and reduction

Designers of a new vehicle or satellite are frequently required by the International Telecommunication Union (ITU) to demonstrate that it can be safely disposed of at the end of its life, for example by use of a controlled atmospheric reentry system or a boost into a graveyard orbit.

Potential concerns

An analysis determined that of the 50 "statistically most concerning" debris objects in low Earth orbit, the top 20 were all SL-16 upper stages.

The Envisat satellite is a large, inactive satellite with a mass of 8,211 kg (18,102 lb) that orbits at 785 km (488 mi), an altitude where the debris environment is the greatest—two catalogued objects can be expected to pass within about 200 m (660 ft) of Envisat every year—and likely to increase.

Current status

In 2023, Anelí Bongers and José L. Torres calibrated an economic model to estimate an aggregate threshold value of 72,000 satellites to prevent a Kessler syndrome scenario and explore space debris' unique negative externality, noting that space debris is unique from other forms of pollution due to its direct effect on capital assets.

In fiction

The 2003 Manga/Anime Planetes has a terrorist organization, the Space Defense Front, try to create a Kessler syndrome catastrophe by colliding an orbital satellite with Space Station Seven, thereby cutting Earth off from the Moon and its sole source of Helium-3, which has become the primary energy source used in the setting.

The 2013 film Gravity features a Kessler syndrome catastrophe as the inciting incident of the story, when Russia shoots down an old satellite.