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Kessler syndrome

Artist's concept of a derelict satellite being reeled in after being harpooned by the e.De...

In 2021, as part of its Clean Space Initiative, ESA plans to launch the e.DeOrbit mission. The aim of this mission is to clean up the important polar orbits between altitudes of 800 to 1,000 km (500 to 625 mil) that face the prospect of becoming unusable due to the increasing buildup of space debris. The ESA has now announced plans to examine the potential for the mission to use space harpoons to capture large items, such as derelict satellites and the upper stages of rockets.  Read More

The Fermi Gamma-ray Space Telescope has a near-collision with Cosmos 1805

Julie McEnery is NASA's Project Scientist for the Fermi Gamma-ray Space Telescope. When she checked her email on March 29, 2012, she was startled to find an automatically generated message stating that in six days, her half-billion-plus dollar satellite was going to cross paths with Cosmos 1805, a Soviet-era spy satellite. The predicted encounter had the two satellites occupying the same coordinates only 30 milliseconds apart. Not only that, but Cosmos was in an orbit moving nearly perpendicular to Fermi such that their collision would be equivalent to tons of high explosives. Essentially total destruction.  Read More

Representation of a satellite being destroyed by collision with orbital debris (Image: ESA...

Orbital debris is (nearly) forever, and threatens to render near-Earth space unusable, and all but impassible. The 2007 Chinese anti-satellite test and an accidental collision between two communications satellites in 2009 highlighted the need to study orbital collisions of modern satellites. The NASA Standard Breakup Model, based on hypervelocity collision studies of 1960s-era satellites, fails to accurately describe collisions of modern satellites, owing to advances made in materials and construction. To address this problem, NASA is updating the SBM by building and destroying a modern dummy satellite called DebriSat.  Read More

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