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Old 12-15-2020, 02:16 PM   #11 (permalink)
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It runs on water and solar power. No coal required.

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Old 12-30-2020, 12:57 PM   #12 (permalink)
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Was just thinking more about ballistically sending materials into Earth orbit today and wondered if maybe it would be easier to send them in smaller payloads but just send more of them and assemble in space. That is, you don't need to send a whole spacecraft in a single shot, but could send relatively smaller payloads which would reduce the size and cost of the railgun.

I wonder what the smallest ion engine is, because it seems those would be the ideal method of propulsion for assembling the various packages together into a specific orbit. I believe each of the hundreds of StarLink satellites have an ion engine.

Interesting, looks like they are called hall effect thrusters in the industry. They are capable of accelerating the propellant to 100,000 MPH.
https://en.wikipedia.org/wiki/Hall-effect_thruster
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Old 12-30-2020, 01:39 PM   #13 (permalink)
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Interplanetary Superhighway


https://www.nasa.gov/images/content/...ighway_med.jpg

This NASA illustration is conceptual, the real solution would require eating a spice that makes you eyes turn blue. (Frank Herbert reference). But the constrictions at each planet are Lagrange points.

This makes Lagrange point natural targets for asteroid recovery, rather than sending them to Earth orbit. Better to send up extraction and fabrication robots instead of finished goods.
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Old 12-30-2020, 10:27 PM   #14 (permalink)
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The nissan leaf and all electric car battery chemistries I know of are coal powered even if all renewable power used to charge them.
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Old 12-30-2020, 11:48 PM   #15 (permalink)
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How do you figure? Steam powered battery factories?
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Old 12-31-2020, 10:07 AM   #16 (permalink)
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I think they are shutting down the coal fired stations here. Does that make my ranger more ECO?
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Old 01-11-2021, 11:30 PM   #17 (permalink)
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They dismantled the coal power plant near Page. I wonder how the town is doing.
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Old 01-12-2021, 02:32 AM   #18 (permalink)
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I saw Alex Jones ranting about 'clean coal'. I think the distinction he was making was between anthracite and bituminous coal, implying anthracite is 100% carbon.

Quote:
Difference Between Anthracite Coal and Bituminous Coal ...
https://www.differencebetween.com/di...tuminous-coal/
Bituminous coal contains 77-87 % carbon, whereas anthracite coal contains more than 87% carbon. • Bituminous coal can be converted to anthracite with time. This process is known as anthracitization. • Bituminous coal is a sedimentary rock, whereas anthracite is a metamorphic rock.

The Differences between Bituminous Coal and Anthracite ...
The Differences between Bituminous Coal and Anthracite Coal | Actforlibraries.org
Anthracite and bituminous coal are two types of coal that are critical to the economy of the United States. Anthracite coal is used in a variety of manufacturing processes, but its primary use is in the formation of steel. Bituminous coal, on the other hand, is the type of coal most commonly used in America to produce electricity.
Apparently bituminous coal has more BTUs, ...and is dirtier. So long as we're off-topic—



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Old 01-15-2021, 04:54 PM   #19 (permalink)
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2020 was a great year for space, and 2021 could be better!



Spaceport Cornwall? R-R use hydrogen fuel. There're other proposals that use [Uranium] salt water as fuel.
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Old 01-15-2021, 05:39 PM   #20 (permalink)
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From the little I know, I've read somewhere that the easiest way the Earth for the Earth to cool would be to provoke some volcanos to spew a bit of ash into the atmosphere. That might not be great for respiratory health, but would reflect more sunlight back into space. But you'd have to be careful. Apparently volcanos could easily cause the next ice age.

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Originally Posted by redpoint5 View Post
I began disliking the word cold once I understood there is no such thing, just like darkness. I'd be looked at funny if I said "there's insufficient heat" instead of just saying "it's cold".
It's still a matter of point of view, kind of like saying "sunrise" and "sunset" instead of "the point at which I stand on Earth has turned 90 in relation to our star."

What you're talking about was coined with the discovery of absolute cold. If there's a point that's absolute and things can only be hotter than that then that must be the base line and anything warmer is, well, warmer so heat must exist and cold doesn't.

But you could also look at it the other way. Many also theorize that there's also an absolute hot as well, which we also believe our universe started out at. So if our universe started out at an absolute hot, maybe that's the base line and anything cooler is, well, cooler so cold must exist and heat doesn't.

And if darkness, coldness and empty space don't exist, does that just mean scientists are optimistic, since the glass is never half empty since it is always full?

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Originally Posted by redpoint5 View Post
Cool to think about,...
You mean "Less hot to think about,..."

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