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Old 01-22-2018, 01:35 PM   #881 (permalink)
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They did at least mention resource depletion. Again, anyone that runs the numbers will easily see that the energy required for harvesting an asteroid and bringing it back to earth orbit falls squarely past won't happen into the category of can't happen.

What is the total sum of mass we ever brought back from the moon? Which is several orders of magnitude energetically closer than the asteroids.

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Old 01-22-2018, 02:17 PM   #882 (permalink)
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Quote:
Originally Posted by sendler View Post
anyone that runs the numbers will easily see that the energy required for harvesting an asteroid and bringing it back to earth orbit falls squarely past won't happen into the category of can't happen.

What is the total sum of mass we ever brought back from the moon? Which is several orders of magnitude energetically closer than the asteroids.
Having not run any calculations, it might take less energy to visit an asteroid and return than to visit the moon and return. A moon landing requires accelerating to it, stopping on it, and then accelerating back to earth. An asteroid rendezvous can conserve the majority of the momentum used to get there, and there is practically no gravity to overcome to leave it. If it were rich in expensive elements such as gold or platinum, it could be economically worthwhile.

That said, I agree with your sentiments that the resources we regularly consume in bulk aren't going to be replenished by asteroids.

We'll get better at reusing materials, and possibly creating new materials out of other other ones.
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Old 01-22-2018, 03:22 PM   #883 (permalink)
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An asteroid rendezvous can conserve the majority of the momentum used to get there, and there is practically no gravity to overcome to leave it.
it takes more energy to slow down and come back than to slingshot Mars to get to the belt. For what? A couple hundred kg's of metal?
These guys are talking about decelerating an entire asteroid all the way back to Earth orbit and then mining nickle and iron. Can't happen. Even at our current peak energy availability. In a matter of decades all of the energy we can get our hands on will be tied up in just trying to grow enough food and get clean water and sanitation for a ballooning population. And feverishly applied to replacing the fossil fuel that will be slipping away. If we are smart. Nothing left over to play with sending humans out into space after that. Ever again.
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Old 01-22-2018, 05:42 PM   #884 (permalink)
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Don't have to go to the asteroid belt.
There are at least 100 of them that cross earth's orbit and large enough to sterilize the planet if they were to impact.
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Old 01-22-2018, 05:53 PM   #885 (permalink)
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Quote:
In a matter of decades all of the energy we can get our hands on will be tied up in just trying to grow enough food and get clean water and sanitation for a ballooning population. And feverishly applied to replacing the fossil fuel that will be slipping away. If we are smart. Nothing left over to play with sending humans out into space after that. Ever again.
There's energy blowing through your body right now, like porn on Wifi.



Brian Cox is exactly right, the biggest threat to humanity is between our [collective] ears. I wasn't surprised that interviewer led with 'post-truth era' and slagged on Brexit and the Presidency. Did anyone see Cathy Newman try that with Jordan Peterson?

And the 20171205 interview is already dated. New Zealand is now a commercial space-faring nation.

You drop a seed on an asteroid in Earth-crossing orbit and proceed to use mining slag in a mass driver. To Moon orbit. Right next to the Bigelow space hotel.

edit: no linky because language, but there is an interview with Brian Cox that was posted on 20171217 (Brian Cox Interview | Russell Brand on Radio X Live Show | Episode 33). Better questions.
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Old 01-22-2018, 06:11 PM   #886 (permalink)
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Don't have to go to the asteroid belt.
There are at least 100 of them that cross earth's orbit and large enough to sterilize the planet if they were to impact.
So what do you do? Put a mining colony on it to self sustain while it goes round until it comes back again several years later and shoot the spoils back to earth at the next near crossing?
.
Gaining the energy to alter the trajectory so as to "park" an asteroid in any different orbit is another one of those ideas that don't even come close to adding up if you run the numbers. Not happening.
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Old 01-22-2018, 06:19 PM   #887 (permalink)
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How is space tether technology looking? Are electric catapults feasible for cargo?

I have always wondered about bombarding Mars with comets.
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Old 01-22-2018, 06:58 PM   #888 (permalink)
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Use a lissajous orbit like the stereo solar obsevation satellites use.
But it will be easier to find what we need here for a very long time.
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Old 01-22-2018, 07:19 PM   #889 (permalink)
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But it will be easier to find what we need here for a very long time.
Yes, we'll have Wally-bots mining old landfills long before we're harvesting space minerals.
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Old 01-22-2018, 08:03 PM   #890 (permalink)
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I once watched Eugene Water & Electric board employees drop $25,000 worth of copper into a landfill. It was in transformers filled with PCB.

Everybody is in too much of a hurry.

https://en.wikipedia.org/wiki/Interp...nsport_Network

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The Interplanetary Transport Network (ITN)[1] is a collection of gravitationally determined pathways through the Solar System that require very little energy for an object to follow. The ITN makes particular use of Lagrange points as locations where trajectories through space are redirected using little or no energy. These points have the peculiar property of allowing objects to orbit around them, despite lacking an object to orbit. While they use little energy, the transport can take a very long time. Shane Ross has said "Due to the long time needed to achieve the low energy transfers between planets, the Interplanetary Superhighway is impractical for transfers such as from Earth to Mars at present."[2]

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