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we need traffic lights for satellites
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m98:

--- Quote from: nuclearcat on August 23, 2021, 11:33:26 pm ---Stupid idea (because i didnt thought a lot about it), what is we deploy one big amount of substance like polyurethane foam that will expand after "cleaner satellite" reach orbit, as it expand, it take large space and work as trap. All objects will be stuck inside it and it wont go pieces, similar what sand and water does to bullets.
Plus attached to the metal mesh net and some kind of engine that can deorbit it, when it gets full or too unstable (too many impacts).

--- End quote ---
Space is big. Imagine trying to stop global traffic violations by deploying two police officers to the Gobi desert.
nuclearcat:

--- Quote from: m98 on August 24, 2021, 01:23:52 am ---
--- Quote from: nuclearcat on August 23, 2021, 11:33:26 pm ---Stupid idea (because i didnt thought a lot about it), what is we deploy one big amount of substance like polyurethane foam that will expand after "cleaner satellite" reach orbit, as it expand, it take large space and work as trap. All objects will be stuck inside it and it wont go pieces, similar what sand and water does to bullets.
Plus attached to the metal mesh net and some kind of engine that can deorbit it, when it gets full or too unstable (too many impacts).

--- End quote ---
Space is big. Imagine trying to stop global traffic violations by deploying two police officers to the Gobi desert.

--- End quote ---
Since it have thruster it can be directed on collision path with debris, to adsorb them. Its big in size, but mass is low, so it wont require lot of fuel.
wraper:

--- Quote from: nuclearcat on August 23, 2021, 11:33:26 pm ---Stupid idea (because i didnt thought a lot about it), what is we deploy one big amount of substance like polyurethane foam that will expand after "cleaner satellite" reach orbit, as it expand, it take large space and work as trap. All objects will be stuck inside it and it wont go pieces, similar what sand and water does to bullets.
Plus attached to the metal mesh net and some kind of engine that can deorbit it, when it gets full or too unstable (too many impacts).

--- End quote ---
You will need a lot of very durable foam to capture something that travels at ~30000 km/h velocity. And as that foam need to stay in orbit as well, up to ~60000 km/h equivalent of hitting stationary object. And then it needs to be able to deorbit itself, otherwise you only create more junk in orbit.

--- Quote ---Since it have thruster it can be directed on collision path with debris, to adsorb them. Its big in size, but mass is low, so it wont require lot of fuel.
--- End quote ---
You cannot simply steer it. Changing direction even slightly takes a huge amount of energy. 
nuclearcat:

--- Quote from: wraper on August 24, 2021, 10:16:36 am ---
--- Quote from: nuclearcat on August 23, 2021, 11:33:26 pm ---Stupid idea (because i didnt thought a lot about it), what is we deploy one big amount of substance like polyurethane foam that will expand after "cleaner satellite" reach orbit, as it expand, it take large space and work as trap. All objects will be stuck inside it and it wont go pieces, similar what sand and water does to bullets.
Plus attached to the metal mesh net and some kind of engine that can deorbit it, when it gets full or too unstable (too many impacts).

--- End quote ---
You will need a lot of very durable foam to capture something that travels at ~30000 km/h velocity. And as that foam need to stay in orbit as well, up to ~60000 km/h equivalent of hitting stationary object. And then it needs to be able to deorbit itself, otherwise you only create more junk in orbit.

--- Quote ---Since it have thruster it can be directed on collision path with debris, to adsorb them. Its big in size, but mass is low, so it wont require lot of fuel.
--- End quote ---
You cannot simply steer it. Changing direction even slightly takes a huge amount of energy.

--- End quote ---
Might be possible, if this foam are in cells, and foam itself is non-newtonian. But sure its not easy.
And not only durable, most likely on impact all this will begin to spin, i.e. it will be difficult to compensate for the kinetic energy from the impact and stabilize such "cleaner satellite" (and it needs to be stabilized, so RF links and solar panels can work properly).
Some minor manoeuvres can be done, but for sure you need to launch such satellites on specific orbits, targeting largest or most problematic debris.

My idea is not original or new: https://www.forbes.com/sites/jamiecartereurope/2020/06/16/well-clean-up-space-junk-using-sticky-foam-spiderwebs-in-orbit-says-russian-space-start-up/
iMo:
Small debris could be swept out with a strong laser gun.
Something like 10MWatt continuous laser beam would do the job, imho..
 :D
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