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Space Forum / Space Flight / August 2003A new planet?
Suppose you joined Mars and Venus together with a big elastic band?  SignaturePeter Fairbrother > Suppose you joined Mars and Venus together with a big elastic band? Suppose pigs had wings ??? -- Gordon D. Pusch perl -e '$_ = "gdpusch\@NO.xnet.SPAM.com\n"; s/NO\.//; s/SPAM\.//; print;' > Suppose you joined Mars and Venus together with a big elastic band? > > -- > Peter Fairbrother It breaks. Or if infinitely elastic, sooner or later, it will be stretched close to/into the Sun. *Then* it breaks. And that's ignoring what the rotations and atmospheres of both worlds, are doing to this thing. Next question? >> Suppose you joined Mars and Venus together with a big elastic band? > > It breaks. Probably. A tether with controlled drag and winches along it's length would be better. I was thinking more in terms of a "star trek tractor beam" as a first approximation. > Or if infinitely elastic, sooner or later, it will be stretched close > to/into the Sun. *Then* it breaks. You can swing it out of the way of the Sun (and the Earth) above the plane. Actually as the orbits are slightly inclined you might not even need to. > And that's ignoring what the rotations and atmospheres of both > worlds, are doing to this thing. Venus's rotation is quite slow, and Mars is lighter. I never said it would be easy... :) However you only (!) have to slow Venus by about 5.2 km/sec and move it 41 Gm away to put Venus at 1AU from the Sun. It's just a wild thought for now. I don't think you could get Venus to more than a ~136 Gm (Earth's orbit is 149 Gm, Venus 108 Gm mean) orbit that way anyway, and even that needs lots of trickery, but I've got more calculations and thinking to do. SignaturePeter Fairbrother > >> Suppose you joined Mars and Venus together with a big elastic band? > > [quoted text clipped - 8 lines] > > You can swing it out of the way of the Sun (and the Earth) above the plane. Much easier said than done.... > Actually as the orbits are slightly inclined you might not even need to. True, but as I noted, it may still come close enough. > > And that's ignoring what the rotations and atmospheres of both > > worlds, are doing to this thing. > > Venus's rotation is quite slow, and Mars is lighter. I never said it would > be easy... :) Well, it's going to be anchored somehow, yes? > However you only (!) have to slow Venus by about 5.2 km/sec and move it 41 > Gm away to put Venus at 1AU from the Sun. Umm, there's already a planet that orbits at that distance.... And keeping them at different parts of the same orbit will not be that easy. Even if you could then tilt the plane of Venus' orbit at 90 degrees to Earth, it's asking for long range trouble. Besides, it's got enough greenhouse gases to stay comfortable, even farther out. > It's just a wild thought for now. I don't think you could get Venus to more > than a ~136 Gm (Earth's orbit is 149 Gm, Venus 108 Gm mean) orbit that way [quoted text clipped - 3 lines] > -- > Peter Fairbrother Yeah, well, *my* favorite fantasy is a wormhole or something similar, to siphon much of Venus' atmosphere over to Mars, and my chances might be about the same as yours..... Umm, actually you have your orbital mechanics mixed up. You have to speed Venus up in order to get it to shift to a higher orbit, an orbit in which it will have a lower velocity ( assuming a stable orbit) but a higher energy state. BTW hello all, I was busy for awhile on a project. SignatureIgnorance is the curse of God, Knowledge the wing wherewith we fly to heaven. --Shak "I can picture a world without war, a world without hate. And I see us attacking that world, because they'd never expect it " I'm certainly no more materialistic than the next guy, but to live in this world one needs certain material things like food, shelter, and a college fund for ones daughter. So who amongst you may judge me for doing what is necessary to meet those needs? "Yea, all israel have transgressed thy law, even by departing, that they might not obey thy voice; therefore the curse is poured upon us, and the oath that is written in the law of Moses the servant of God, because we have sinned against him." Daniel 9-11 > >> Suppose you joined Mars and Venus together with a big elastic band? > > [quoted text clipped - 23 lines] > anyway, and even that needs lots of trickery, but I've got more calculations > and thinking to do. > Suppose you joined Mars and Venus together with a big elastic band? Google back to my post here earlier this year regarding a "jumprope" connecting Phobos and Deimos. Analogous mechanics here, but way more huge in scale. An attachment of this scale would have to be elastic to some degree, but to make the sun play jumprope with two planets, the elasticity would have to be reasonably bounded. Materials? Jim McCauley |
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