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Re:Bring back hydrogen lifting gas by josephcsible on Monday August 09, 2021 @02:36PM (#28120509)
> Rocket launches are extremely expensive, and most of it is in the lifting costs. Would it be cheaper to "lift" a rocket with hydrogen slowly?

No: https://what-if.xkcd.com/58/

Re:Bring back hydrogen lifting gas by soperj on Monday August 09, 2021 @02:38PM (#28120545)
>Getting to space[1] is easy. It's not, like, something you could do in your car, but it's not a huge challenge. You could get a person to space with a small sounding rocket the size of a telephone pole. The X-15 aircraft reached space[2] just by going fast and then steering up.[3]

Loved that line. Puts the Branson/Bezos thing into perspective.

Re:Bring back hydrogen lifting gas by toomanybeersies on Monday August 09, 2021 @03:15PM (#28121087)
These days there are even amateur rocket clubs that have managed (unmanned) suborbital space launches [1].

[1] http://www.uscrpl.com/traveler-iv

Re:Bring back hydrogen lifting gas by josephcsible on Monday August 09, 2021 @02:47PM (#28120668)
It's not impossible, sure. It's just usually not worth it.
Re:Bring back hydrogen lifting gas by R0b0t1 on Monday August 09, 2021 @02:37PM (#28120525)
The idea is that this gets you above the densest atmosphere and that could save you fuel. I used to think this, but if you run the numbers it doesn't work out.