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A Guide to Isaac Asimov's Essays

During an international meeting last week, scientists discussed possibilities to remove some of the more high-risk materials from low-Earth orbit. One possibility would involve launching new spacecraft into orbit, latching onto the defunct spacecraft or debris and boosting it into the ocean.

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Not, of course, that the Culture would do anything as delinquent as actually deconstructing a planet to make Orbitals; simply removing the sort of wandering debris (for example comets and asteroids) which the average solar system comes equipped with and which would threaten such an artificial world's integrity through collision almost always in itself provides sufficient material for the construction of at least one full Orbital (a trade-off whose conservatory elegance is almost blissfully appealing to the average Mind), while interstellar matter in the form of dust clouds, brown dwarfs and the like provides more distant mining sites from which the amount of mass required for several complete Orbitals may be removed with negligible effect.

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The Department of Defense has a space surveillance network that tracks tens of thousands of man-made objects in orbit, including the biggest baddest pieces of space junk out there. These are the 23,000 objects bigger than a baseball, or 10 centimeters or larger in size. And scientists also monitor the objects falling back to Earth.

According to the European Space Agency (ESA) the number of collision alerts has doubled in the past decade. Nicholas Johnson, the chief scientist for orbital debris at ESA's American equivalent, NASA, says modelling of the behaviour of space debris “most definitely confirms the effect commonly referred to as the Kessler syndrome”. Even the National Security Space Office at the Pentagon is worrying about whether a tipping-point has been reached, or soon will be.

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However, many space agencies are considering a third option: robot missions that would dock with dead satellites and fire rockets either to boost them into “graveyard” orbits or to deorbit them completely, so they crashed into the sea. Jer-Chyi Liou, an expert on orbital debris at NASA, estimates that if such a mission started in 2020, and removed the five objects most likely to create future debris, it would more or less solve the space-junk problem.

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