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# The only physical factor preventing a human journey to Mars

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Manager
Joined: 10 May 2009
Posts: 65
The only physical factor preventing a human journey to Mars [#permalink]

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07 Jun 2009, 02:58
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The only physical factor preventing a human journey to Mars has been weight. Carrying enough fuel to propel a conventional spacecraft to Mars and back would make even the lightest craft too heavy to be launched from Earth. A device has recently been invented, however, that allows an otherwise conventional spacecraft to refill the craft’s fuel tanks with fuel manufactured from the Martian atmosphere for the return trip. Therefore, it is possible for people to go to Mars in a spacecraft that carries this device and then return.
Which one of the following is an assumption on which the argument depends?
(A) The amount of fuel needed for a spacecraft to return from Mars is the same as the amount of fuel needed to travel from Earth to Mars.
(B) The fuel manufactured from the Martian atmosphere would not differ in composition from the fuel used to travel to Mars.
(C) The device for manufacturing fuel from the Martian atmosphere would not take up any of the spaceship crew’s living space.
(D) A conventional spacecraft equipped with the device would not be appreciably more expensive to construct than current spacecraft typically are.
(E) The device for manufacturing fuel for the return to Earth weighs less than the tanks of fuel that a conventional spacecraft would otherwise need to carry from Earth for the return trip.
Director
Joined: 03 Jun 2009
Posts: 781
Location: New Delhi
WE 1: 5.5 yrs in IT

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07 Jun 2009, 04:27
Clearly E. The reason being that
1st - Author is saying the spacecraft cannot carry enough fuel because of weight factor
2nd - Author says that it is possible for spacecraft to carry this device
This means author is assuming weight of this device is less than weight of fuel.
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Manager
Joined: 07 Jun 2009
Posts: 204

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07 Jun 2009, 04:36
I go for 'E' too.
we are talking about weight and assuming that the weight of the machine would be lesser than that of an additional fuel tank, which would carry the fuel for the backward journey.
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SVP
Joined: 21 Jul 2006
Posts: 1508

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07 Jun 2009, 05:24
I pick E for the same reasoning mentioned above.
Director
Joined: 05 Jun 2009
Posts: 805
WE 1: 7years (Financial Services - Consultant, BA)

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07 Jun 2009, 06:09
Definitely E (0:54)
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Manager
Joined: 24 May 2009
Posts: 102

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27 Jun 2009, 16:04
It's E .
Re: journey to Mars   [#permalink] 27 Jun 2009, 16:04
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# The only physical factor preventing a human journey to Mars

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