I get "across the Atlantic" but who are we doing space business with across the solar system?
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When the ESA gets around to launching humans into space, hopefully it will include Canadians. If Europe ever gets its act together and decides to become an informal republic of autonomous states, it would certainly hurry things up. There is no reason why a unified Europe could not leap over the US in space. They have the money, and they could certainly create a company to rival SpaceX. Over the last 8 decades, they became lax and put too much dependence on America. They put all their investment money into American ventures, not their own. That seems to be changing recently. CERN really did boost their confidence, and now China has decided to invest in the European next generation collider instead of building their own in China.
Maybe Canadians will see the light, and divert our investment dollars into Europe instead of America.
FUCK YEAH! LET'S DO SOME MOTHERFUCKING SPACE STUFF!*
*To be clear, I say this unironically.
And specifically space stuff that isn't aligned with the fascist assholes to the south.
How about we build O'Neill Cylinders at Lagrange points L4 and L5? Made entirely with ISRU from asteroid mining, of course...
I mean, in principle, it is theoretically possible to build a literal trans-Atlantic physical bridge. Hell, in theory, you could build a bridge that would let you walk all the way to Mars if you really wanted to. The laws of physics allow such things, without impossible materials.
Keppler would like a word with you...
You don't know orbital mechanics as well as you think you do! Look up concepts like the orbital ring and launch loops, structures built on the interplay of orbital momentum rather than static material strength. I'm dubious whether there would ever be an economic reason to build a train track all the way to Mars. But from a pure physics perspective, it's entirely possible.
There are more things in Heaven and Earth than are dreamt of in your philosophy.
Might get a little warm in the middle during some parts of the orbit.
It would really have to be a flexible accordion bridge. The two planets rotate around the sun at different speeds.