RE: Solar power's "bright future"

Thu, 19 Jun 2014 22:31:18 -0700 

 

 

From: [email protected] 
[mailto:[email protected]] On Behalf Of LizR
Sent: Thursday, June 19, 2014 9:20 PM
To: [email protected]
Subject: Re: Solar power's "bright future"

 

On 20 June 2014 14:24, 'Chris de Morsella' via Everything List 
<[email protected]> wrote:

 

From: [email protected] 
[mailto:[email protected]] On Behalf Of LizR
Sent: Thursday, June 19, 2014 7:09 PM


To: [email protected]
Subject: Re: Solar power's "bright future"

 

Wow. I hope he has plans to protect those Marsnauts from cosmic rays.

 

Once on Mars, Mars dirt (piled a few meters thick on top of the habitat) can do 
the job. it is on the way there and on the way back that is hard to see how 
they could be shielded. 

 

Yes, I realise that. I was thinking of the journey. The only viable method 
known at present is to find an asteroid that crosses Earth's and Mars' orbits 
and burrow into that (for both journeys - so you spend more or less the entire 
trip underground, one way or another!)

Interesting idea. It could also be done with electric rockets (such as the 
VASIMIR) that could cut the travel times down to around five months, which is 
doable in terms of accumulated radiation dosage (from the cosmic rays and solar 
flux)… especially if the astronauts are older. The big problem with these 
rockets – besides the power they need, is how to get rid of the waste heat. 
With a chemical (or nuclear thermal) rocket the heat is removed in the hot gas 
thrust; electric rockets (from what I have heard) require large radiator 
systems in order to radiate away excess waste heat.

Nothing is easy in space.

 

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