[ExI] Skylon as first stage.

Eugen Leitl eugen at leitl.org
Thu Apr 21 09:03:20 UTC 2011

On Wed, Apr 20, 2011 at 09:47:38AM -0600, Kelly Anderson wrote:

> How much of the material necessary to create solar power satellites is
> easily obtainable from the moon?

There are multiple ISRU projects under way:



> Also, the rocket that runs from a laser based on the ground... could
> that work from the moon just as well? What would the propellant be?

On the Moon, you can use linear motor/magnetic levitation launches.

You ideally start at one of the poles, creating annular structures
to make use of 24/7/365 insolation, and then progressively working yourself
towards the equator, building high-voltage transmission to provide
power to the night side to avoid shutting down for two weeks.

> Since there are no airplanes on the moon, it seems like a bit
> safer/easier place for that system.

The whole idea is to tap extraterrestrial materials and energy
sources to escape the limits of a crowded planet and a vulnerable
> I assume the water from the moon topic has been done here.
> http://www.ted.com/talks/bill_stone_explores_the_earth_and_space.html

You don't need much water for ISRU producing materials and launch

Eugen* Leitl <a href="http://leitl.org">leitl</a> http://leitl.org
ICBM: 48.07100, 11.36820 http://www.ativel.com http://postbiota.org
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