gr8scot writes: It probably won't do any harm, but it is certainly expensive. 'Hydrazine is harmful to the human central nervous system and can be fatal in big doses. However, it breaks down quickly in heat and ultra-violet light, the French security agency Ineris said in a report. Specialists cited in the New York Times said the hydrazine would burn off if the fuel tank breaks, as is likely, when re-entering the atmosphere.' And, among all those other satellites, why isn't there one for maintenance, or at least with a grappling hook to put the broken ones in a stable, unpowered orbit until repairs can be done? Article: 'The United States has a thick web of billion-dollar satellites monitoring the Earth, some including high-powered telescopes or radars, with the capability to zoom in and help launch precision strikes on enemy targets.' And, not one to zero in on the other satellites, when they become 'enemy targets'? Geniuses! I realize it's space, distances are great, and "thick web" is a relative term. '"Since we've been in the business of doing that, for 50 years or so, there have been more than 17,000 man-made objects that have re-entered the Earth atmosphere."' But, in light of the fact that 17,000 satellites — most of them owned and/or put there at the expense of the United States — have re-entered the atmosphere, I estimate that "web" is thick enough for maintenance to be as reasonable as putting them into orbit in the first place, for long-term cost efficiency alone.