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(From Quarks to Quasars)   "Imagine a screw traveling 20,000 miles an hour). That debris would then hit other objects in orbit, which creates more debris and hits more objects and....you get the picture"   ( fromquarkstoquasars.com) divider line
    More: Scary, space junk, communication satellites, orbits, space systems, EPFL, Lausanne, ETH Zurich  
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3778 clicks; posted to Geek » on 09 Dec 2013 at 11:45 AM (4 years ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»

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2013-12-09 12:08:32 PM  
2 votes:
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2013-12-09 04:09:14 PM  
1 vote:

Quantum Apostrophe: It's the people that think we'll colonize the universe.

We're in a thread about debris that is actually in orbit around our actual planet, put there by actual people using actual science.  The only one going on about 'colonizing the universe', as usual, is you.  While you occasionally make interesting (and obvious points) you immediately follow up with a straw man larger than can reasonably be created with any number of 3D printers and then thrash the hell out of it, all the while explaining to everyone else how stupid they sound.
2013-12-09 01:03:03 PM  
1 vote:
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2013-12-09 12:58:42 PM  
1 vote:
Quantum Apostrophe:  That's a low-cost screw in any case, what's it doing in space?

Because in the time-frame of the Planetes universe, space travel is low-cost. The very first scene had a passenger craft being destroyed by a Gravity-esque incident.
2013-12-09 12:48:08 PM  
1 vote:

PsyLord: FTA: ...(imagine a screw traveling 20,000 miles an hour). That debris would then hit other objects in orbit

Aren't the other objects in orbit also traveling roughly the same speed?  The way they stated it in the article made it sound as though the screw is going to impact something that was not moving, so in essence a 20k mph hit.

Not necessarily. For starters, they could be traveling in the exact same orbit, but in the opposite direction. All the math works out the same, except that you get a closing speed of 40,000 mph. That would be unusual -- you generally launch into an orbit that lets you take advantage of the Earth's spin -- but not impossible. A more likely scenario is that one object was in something closer to a polar orbit, and the other something closer to equatorial.

In geosynch orbit, things in general will have low relative velocities -- the whole point of being up there is to stay "over" one point on the equator, and so everything's moving with approximately the same velocity. And there's less stuff up there as well, because it's harder/more expensive to get to.

Putting a big sandbag into a retrograde geosynchronous orbit (same altitude/period, opposite direction) and then popping it would be a terrible thing to do to a civilization.
2013-12-09 12:29:56 PM  
1 vote:

RangerTaylor: Do you have issues with fantasy as well?

He was a tender 9 when his application for Space Camp was turned down... the scars run deep.
2013-12-09 11:59:31 AM  
1 vote:
This reminds me of something the Submarine Force refers to as the 'Big Ocean, Small Boat' theory.  In effect, it seems impossible that of all the ocean, two submarines would happen to be in the exact same place at the exact same depth at the exact same time.  What people don't think about is that in the ocean, like in orbit, there are places where it makes sense to be.  Communication satellites and such HAVE to be in a certain place to work.  Same thing with submarines.  The realities of operations force you into close proximity, with big empty areas that are empty because nobody has any reason to be there. In reality, they say the odds of a collision are something along the lines of three orders of magnitude higher than pure chance averaged over all of the available area.
2013-12-09 11:54:01 AM  
1 vote:
Gunnery Chief: This, recruits, is a 20-kilo ferrous slug. Feel the weight. Every five seconds, the main gun of an Everest-class dreadnought accelerates one to 1.3 percent of light speed. It impacts with the force of a 38-kilotomb bomb. That is three times the yield of the city buster dropped on Hiroshima back on Earth.That means Sir Isaac Newton is the deadliest son-of-a-biatch in space. Now! Serviceman Burnside! What is Newton's First Law?

Recruit: Sir! A object in motion stays in motion, sir!

Gunnery Chief: No credit for partial answers, maggot!

Recruit: Sir! Unless acted on by an outside force, sir!

Gunnery Chief: Damn straight! I dare to assume you ignorant jackasses know that space is empty. Once you fire a husk of metal, it keeps going until it hits something. That can be a ship, or the planet behind that ship. It might go off into deep space and hit somebody else in ten thousand years.
If you pull the trigger on this, you're ruining someone's day somewhere and sometime. That is why you check your damn targets! That is why you wait for the computer to give you a **** firing solution! That is why, Serviceman Chung, we do not "eyeball it!" This is a weapon of mass destruction. You are not a cowboy shooting from the hip!

Recruit: Sir, yes sir!"

/somewhat relavent
//obviously not obscure
2013-12-09 11:52:28 AM  
1 vote:
So, the movie Gravity, but in real life.

/Boring movie, IMO
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