XPost: sci.space.policy, sci.physics
From: fjmccall@gmail.com
Serigo wrote:
>On 10/12/2016 7:06 PM, Fred J. McCall wrote:
>> Serigo wrote:
>>
>>> On 10/12/2016 4:12 PM, Fred J. McCall wrote:
>>>> Serigo wrote:
>>>>
>>>>> On 10/11/2016 11:01 PM, Fred J. McCall wrote:
>>>>>> jimp@specsol.spam.sux.com wrote:
>>>>>>
>>>>>>> In sci.physics Jeff Findley wrote:
>>>>>>>> In article , invalid@invalid.com says...
>>>>>>>>>
>>>>>>>>> there is no reason for man to go to Mars.
>>>>>>>>
>>>>>>>> Opinion.
>>>>>>>>
>>>>>>>>> It is rocks and sand in a vaccum.
>>>>>>>>
>>>>>
>>>>>>>>
>>>>>>>>> no food, no water, no air.
>>>>>>>>
>>>>>>>> There is a bit of water on Mars (e.g. polar regions) and again a CO2
>>>>>>>> atmosphere. Food could be grown.
>>>>>
>>>>>>> Not without horrendous effort.
>>>>>>>
>>>
>>>>>> For some small value of 'horrendous'.
>>>>>>
>>>>>>>>> send a robot.
>>>>>
>>>>>>>> Been there, done that. They're s-l-o-w and return very little science
>>>>>>>> compared to a manned mission.
>>>>>>>
>>>>>>> Wrong.
>>>>>>>
>>>>>>
>>>>>> No, he's right and we know that for a fact.
>>>>>>
>>>
>>>>>>> Robots return whatever science they are built to explore and work 24/7
>>>>>>> without need for food, air, water, potty breaks, or sleep.
>>>>>>>
>>>>>>
>>>>>> And humans working ordinary shifts can cover more ground and
>>>>>> accomplish more in a few weeks than your toaster can do in years.
>>>>>> Humans can also deal with things 'outside' the program by reacting to
>>>>>> the data as they collect it.
>>>
>>>>> silly.
>>>>> remember that any human on Mars must stay below surface 95% of the
>>>>> time to avoid radiation.
>>>>>
>>>>
>>>> Bullshit, troll. Shielding vehicles is easy.
>>>>
>>>
>>> cant use lead, must use water. OR bury it below ground.
>>>
>>
>> Don't need lead. Don't need water. Don't need to bury it.
>
>so how do you shield it ?
>
If you want to be sophisticated, hydrogenated BNNTs. You can even
weave spacesuits out of them and get significant shielding. If you're
willing to be less so, build with a sandwich made from polyethylene
between aluminum plates. Remember, we're talking VEHICLES here, like
what would be used to explore the surface. Fixed habitats would
likely be mostly buried, since that's easiest.
>
>you are uninformed. lots of NASA studies out that prove you have to be
>burried about 20 foot down.
>
To get the radiation level to what it is at the surface of the Earth.
But you don't need to get it that low
>
>and stay there 95% of the time
>
Bullshit. Normal Earth surface dose a year is around 3.6 mSv a year.
A dose of 100 mSv a year is the threshhold at which small but
noticeable increases in cancer occur. Current astronaut limits are
about 5x that (and the assumption that you won't do that for more than
a couple of years). With NO shielding the annual dose on the Martian
surface is about 280 mSv per year.
So do the math, dumbass. If a Mars explorer wanted to stay under the
100 mSv/yr level and lived in a habitat that was buried under 5 meters
of Martian regolith (so getting Earth surface radiation dosage) he
could spend around 8 hours a day on the surface with little to no
shielding.
That's a lot more than 5%, bucko. You really seem uninformed.
--
"Ignorance is preferable to error, and he is less remote from the
truth who believes nothing than he who believes what is wrong."
-- Thomas Jefferson
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
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