DARPA Aims To Reuse Space Junk 67
CowboyRobot writes "Space junk has increased to the point where pieces of it are colliding and breaking into smaller pieces. The problem is now so bad that NASA has had to modify the design of satellites to protect them from flying debris. The Defense Advanced Research Projects Agency (DARPA) wants to turn disabled satellites and their components, including antennas and solar arrays, into functioning systems. They are hosting a conference on June 26 to explore how to build 'refurbished' satellites from already-orbiting material for less than what it would cost to build them from scratch and launch them from the surface of the Earth."
good idea (Score:5, Insightful)
Re:Overheard in Cheyenne Mountain (Score:4, Insightful)
To continue your analogy... a car in the junkyard likely has nobody keeping an eye on it and has no alarms to go off if you try to force entry. A car on the street likely has the owner not too far away and will probably have some kind of alarm (if not security, then something operational that will scream if interfered with).
Re:good idea (Score:5, Insightful)
I don't see how this is workable. The space junk is spread-out across thousands of miles, and you'd waste a lot of fuel moving around trying to collect it all. Plus, what do you do once you have your pile of trash in your space vehicle? There's no engineers/technicians to assemble it into something usable.
A wiser course would be to outlaw leaving junk in space..... if you send a rocket into space, make sure to deorbit the spent stages immediately. If your satellite is EOL, then deorbit that too.
Re:good idea (Score:5, Insightful)
It costs several dollars a gram to get it up there...
The trouble is that most of that cost isn't lifting it to altitude, but getting it moving at the right velocity for the orbit you want. If you put some sort of recycling device in orbit, almost all of the junk that it encounters will be moving at high velocity relative to your device's orbital velocity. Speed will tend to be similar, but direction will be all over the place. Changing the velocity of either the device or the junk is difficult.
Lead is a reasonably valuable metal, but stationing yourself in no man's land between two armies and recycling the bullets that come at you seems a difficult way to obtain it.
Japanese already did it! (Score:4, Insightful)
Planetes [imdb.com]