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Igloos rely on compressive strength though. On mars you would need 30 meters thickness of ice just to balance earth sea-level pressure.

The igloo structure would probably be good for domed habitats deep underground though. In that case you probably don't want to use ice due to the contained heat. Underground domed habitats would be nice though, especially if you could figure out some way to project a sky onto them.
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The revised definition of space thatís expected to be adopted next year at 80KM means that this is a definite spaceflight.

I don't know if it will be adopted. The FAI only said it would hold a discussion with the International Astronautical Federation (IAF) in 2019 to explore the idea further.

The article I read covering this flight made it sound like it was almost a done deal?
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I would say, go back to the basics.  Of course, it works better at the poles, but if you can make bricks, you really don't need sophisticated technologies.

see: 
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http://www.lockblock.com

I thought this was an interesting method of making tunnels quickly out of preformed blocks without mortar. TBC and The Brick Store of course have their own take on making blocks. There may be circumstances where digging a trench and building the tunnel like this rather than using a TBM might be faster and cheaper.

No idea if theyíre water/vacuum proof, but TBC tunnels are also lined with preformed segments so itís likely possible to achieve it.
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The revised definition of space that’s expected to be adopted next year at 80KM means that this is a definite spaceflight.

I don't know if it will be adopted. The FAI only said it would hold a discussion with the International Astronautical Federation (IAF) in 2019 to explore the idea further.
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Virgin Orbit/Virgin Galactic / Space Ship Two - General Thread (4)
« Last post by Star One on Today at 07:06 PM »
The revised definition of space thatís expected to be adopted next year at 80KM means that this is a definite spaceflight.
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Hereís the view released by VG
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Wednesday, December 19, 1:57 UTC for everybody needing the more usual conversion to their local time.
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Congratulations to all concerned. On the BBC it said Branson had promised commercial flights by March 2019.
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