There are eliptical orbits (but much slower) that shuttle between Earth and Mars using a minimum of fuel. This allows for a much larger vessel to be accumulated which can start out on an unmanned basis to transfer stuff to Mars and back. After enough shielding and later a food production facility is accumulated, manned operation can be started.
On Sunday, October 28, 2012 06:17:04 AM Mega wrote:
We've gone far away from biology, haven't we?
Well, when you said one would need radiation shielding, I thought of a spacecraft that resembles the "500 Bio Dollar approach". Because "Mars direct" *needs* lower shielding. I think the study/report was done by the (father of G.W.B) Bush administration. Meaning the craft has roughly the mass of the ISS.
And if the life supporting systems are done by algae in aquarium as someone above said, you would need big aquariums. If the aquarium has 2meters*2 meters *1 meter, you would have 4 tons of water. For a spacecraft that has 400 tonnes, that'd be ok, if it also provides oxygen and cleans the air from CO2.
For a Mars Direct approach, 4 tons is much more, meaning the plan to fail perhaps.
I'm not american, so I've got no big overview on who ceases plutonium production, but obviously it was under the Obama administration. I like biology far more than those politics, which determine the kind of transport used. Technology is not the limiting factor, by far not. Money is.
Also, the original issue then was Biospheres on Mars, not how to get them there. I'm no expert in that, just know and apply the rocket equation and some hohmann transfer orbit theory.
And more in detail, I was inerested in bacteria producing biospheres by making greenhouse gasses. You just would have to take 1 Gramm of bacteria to Mars, and they would multiply and do the job. No big deal, hwo you get them there, each rover could carry that payload.
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