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Sending Astronauts On a One-Way Trip To Mars
The Narrative Fallacy writes "Cosmologist Lawrence M. Krauss, director of the Origins Initiative at Arizona State University, writes in the NY Times that with the investment needed to return to the moon likely to run in excess of $150 billion and the cost of a round trip to Mars easily two to four times that, there is a way to reduce the cost and technical requirements of a manned mission to Mars: send the astronauts on a one way trip. 'While the idea of sending astronauts aloft never to return is jarring upon first hearing, the rationale for one-way trips into space has both historical and practical roots,' writes Krauss. 'Colonists and pilgrims seldom set off for the New World with the expectation of a return trip.' There are more immediate and pragmatic reasons to consider one-way human space exploration missions including money. 'If the fuel for the return is carried on the ship, this greatly increases the mass of the ship, which in turn requires even more fuel.' But would anyone volunteer to go on such a trip? Krauss says that informal surveys show that many scientists would be willing to go on a one-way mission into space and that we might want to restrict the voyage to older astronauts, whose longevity is limited in any case. "
The cost savings of a one-way trip are minuscule now as everyone has accepted that ISRU of propellant on Mars is an essential part of any mission plan. You don't take with you all the fuel you need to get back.. you make it there.. and most of the plans call for a fully fueled return-to-earth vehicle to be sitting ready on the surface before you send astronauts from Earth to it.
The real problem is radiation exposure. 6 months there, 500 days on the surface, 6 months back. Any astronauts you send will never fly in space again and may have trouble getting x-rays for medical problems in the future. The only known solution to this is to make the habitat module more massive.. which of course requires more fuel...
How we know is more important than what we know.
While animals do taste great, meat is very inefficient in terms of how much energy goes into first growing the plants then growing the animal. It would be 10x more efficient to just grow soy beans and other high protein meat substitutes.