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What is the Universe expanding into..
What is the Universe expanding into..
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View Poll Results: Do you think there was anything before the big bang?
I don't think there was anything before the Big Bang 18 8.78%
I think something existed before the Big Bang 85 41.46%
I don't think the big bang happened 25 12.20%
I think the universe is part of a mutiverse 98 47.80%
Multiple Choice Poll. Voters: 205. You may not vote on this poll

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Old Today, 08:17 AM   #3681
KaffiMann is offline KaffiMann  Norway
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What is the Universe expanding into..
Perhaps it would be possible to carefully dismantle Ganymede and put most of it on "standby", get down to the iron core and get that moving towards Mars.
Would it be possible to crack open Mars a bit?

After the core has been "transplanted" the other materials could be sent in a controlled manner to rebuild a new and more suitable planet.

Should not be more far fetched than other some plans?
Much better than dooming a lot of people to forever live in low gravity.
The gravity and mass density of both Mars and Ganymede is relatively low, but put together into a new planet it would be much more suitable. We're still a bit off in terms of gravity, not sure where we could get more iron from.

Edit:
For moving materials to and from planets with a specific gravity, perhaps we could make a "slingshot" using high tensile strength fiber wire of some sort, and big weights that are lifted up slowly using a little bit of energy over longer time. When they have been lifted to the right position a basic electro magnet can hold it in place while the gears and lifter motors are disconnected, countdown to cut power on the magnet. Acceleration should be steady if the wire is tight, and the spacecraft would be shot out at an angle (not directly up), after a successful launch the spacecraft would engage engines and steer in the desired direction.

Edit2:
Another version could perhaps be a huge blowtube like a a bastard mix between a potato gun and the vacuum tube trains.
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Old Today, 09:23 AM   #3682
system7 is online now system7  United Kingdom
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There really ought to be a way to move materials around the Solar System without expending energy. Just that it's quite a fierce Physics problem.

Presumably as long as you are moving downhill in the Sun's gravity well you gain energy. But it's not that simple. You'd think a probe to Mercury is going downhill, but actually you need enough rocket power to match the escape velocity of the Solar System. Which is why missions to Mercury are rare.

In atoms, the "orbiting" electron can spontaneously drop to a lower level, like 2p to 1s. Strangely 2s to 1s is forbidden for angular momentum reasons that always confuse me:
Hydrogen atom - Wikipedia

Blue Sky thinking, but maybe we need a sort of Space Elevator that can balance out some of the forces. I am thinking of a belt drive like a Van de Graaf generator.
Van de Graaff generator - Wikipedia

I am a terrible brag sometimes, but I once fixed one of these things with a sellotape belt after the rubber one perished. Thing hadn't had a run for about 20 years, a dusty relic, so I was fascinated.

Cost my College about 1,000 in electrostatic damage causing strange random crashes in the upstairs computer centre and a wasted afternoon for the guys in White coats who worked therein. They spent the afternoon in the coffee bar having failed to fix the problem.

But I can honestly say I reached 1 Mev ( 5% lightspeed with protons, or near lightspeed with electrons... ) in the basement Physics lab. Big sparks that day.

I had to agree to fix a date up with one of my girlfriend's luscious friends for the smart computer guy, Clyde, who figured out who the culprit was, to keep him quiet. I was the usual suspect when the College blacked out or the fire alarm went off. He kept schtumm, bless him. My career was saved again. Don't know how his date went.
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Old Today, 11:49 AM   #3683
Galu is offline Galu  Scotland
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After your misuse of the Van de Graaff generator, Steve, you should have been charged!
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Old Today, 12:06 PM   #3684
system7 is online now system7  United Kingdom
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After I blew up a 2000 wirewound 2H solenoid in some dumb experiment with magnetic fields, by retiring to the coffee bar whilst it did its thing and overheated, it resulted in letting a lot of the smoke out, Professor Rice-Evans, a cool guy who looked like Sir. Lancelot Spratt, told me not to worry,

A good Physics experiment, quoth he, cost Millions.

The smoking gun on my involvement in the Van De Graaf Generator fiasco, was that I was running a Hewlett-Packard graph plotter on the dull Mossbauer effect - Wikipedia.

When I came back from the Coffee Bar to see how it turned out, I found huge spikes in the plot everytime I sparked up the Van De Graaf. It actually gave an exact timing on my sparks, which happened to coincide with the exact times when the computers crashed.

Mea Culpa. Actually I had more expensive disasters. But all good fun.

TBH, most of the other Science Departments had more to be ashamed of.
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Old Today, 12:37 PM   #3685
kevinahcc20 is offline kevinahcc20  United States
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You might want to review Newton's Third Law of Motion before you get too far along on that space slingshot.
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Old Today, 12:50 PM   #3686
system7 is online now system7  United Kingdom
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I'm not sure action and reaction helps a lot here.

I don't make this College stuff up.

I just looked up Professor Peter Rice-Evans:

Quote:
Originally Posted by Royal Holloway 2012
ANNOUNCEMENTS:

To note that Professor Peter Rice-Evans BSc, PhD, DSc (London), MBA (Columbia) died on 21 February. Peter was Lecturer, Bedford College (1962-78), Reader in Experimental Physics, Bedford College (1978 – 88), Professor of Experimental Physics, RHBNC (1988 – 99). Peter was noted for his contributions on the College Council and Academic Board. He remained active as Emeritus Professor and Leverhulme Fellow and contributed to the book Bedford College: Memories of 150 Years
A good man. Got me out of a few scrapes. Notable for wearing waistcoats and bow ties. A bit of a ladies man I suspect.
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Old Today, 02:32 PM   #3687
Bonsai is offline Bonsai  Europe
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If you want to move big bodies in the solar system around or into different orbits you have to think 100-200 million yrs.

It will require a lot of planning (computer simulation etc) and enough energy to get reasonably large body moving - say something the size of Phobos. You use that to perturb the orbit of a bigger object etc and you then bootstrap the process up until you are able to shift something like the Earth at 6.6^23 metric tons.

We are probably not ready to do something like this for another few millennia (think of the computational issues catering for eventualities for example) and maybe we only have the technology for the initial move in say 100k yrs. However, if we are serious about making the planet habitable beyond the 200 million yrs we have left, then as a species, we will have to make a start in the next million yrs or so.

That said, it might be easier to terraform something like Mars, Ganymede or Titan - insurance policies.
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Old Today, 03:21 PM   #3688
KaffiMann is offline KaffiMann  Norway
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What is the Universe expanding into..
Quote:
Originally Posted by kevinahcc20 View Post
You might want to review Newton's Third Law of Motion before you get too far along on that space slingshot.
Isn't it enough to just have two slingshots firing in opposite directions?
Must be much easier than making some silly space elevator (good luck!), or using fuel for the initial acceleration where it is less effective per distance travelled.

Edit:
In case you missed it I was thinking about how to launch spacecraft from planets, it was not about travelling from one location to the next in space.
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Last edited by KaffiMann; Today at 03:27 PM.
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Old Today, 04:01 PM   #3689
Galu is offline Galu  Scotland
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Quote:
Originally Posted by KaffiMann View Post
For moving materials to and from planets with a specific gravity, perhaps we could make a "slingshot" using high tensile strength fiber wire of some sort...
The type of 'slingshot' currently employed for moving objects around the solar system is the 'gravitational slingshot'.

I like your idea of a giant catapult though. Newton 3 would not be a problem provided the payload was of small mass.
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