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• Electric acceleration
  ...lant. Propellant for a chemical rocket is the spent fuel, and the chemical reaction only creates enough energy to accelerate the exit velocity so far. Differen ...efficiency. Heavy gasses like Xenon and Krypton are a way to increase gas mass without increasing the number of ions.
  5 KB (841 words) - 04:02, 21 January 2009
• Exhaust velocity
  m_e is the [[reaction mass]] of the rocket engine<br> T_o is the operating temperature of the rocket’s reaction chamber<br>
  8 KB (1,440 words) - 04:02, 21 January 2009
• Hydrogen
  ...ermal rockets and chemicals rockets, and is also needed for the [[Sabatier reaction]]. [[Deuterium]], an isotope of hydrogen (²H), can be used for [ ...core nuclear thermal rockets do not make order of magnitude differences in mass fraction over chemical propulsion on short flights like a mission to [[Mars
  4 KB (671 words) - 04:02, 21 January 2009
• ISRU
  ...e must be reduced. This can come from either lowering the cost of shipping mass into orbit ([[Cheap Access to Space]]) or devising ways of producing the re *See: [[Sabatier reaction]]
  6 KB (875 words) - 04:02, 21 January 2009
• Mars Direct
  ==[[Mass Allocations for Mars Direct|Mass Figures]]== ...anded article focusing specifically on this information, see the article [[Mass Allocations for Mars Direct]]''
  7 KB (1,088 words) - 00:39, 20 March 2010
• NILFiR
  ...over, not least because it cannot possibly be used in a nuclear bomb. The reaction would most likely be in the liquid phase, with a mixture of pure elemental ==The Reaction==
  5 KB (805 words) - 10:22, 1 September 2010
• Single-stage to orbit
  ...ty. Thus, the mass of the fuel itself might be high enough compared to the mass of the tank and insulation to make it more efficient. ...low density, meaning the tanks have to be much larger to contain the same mass of fuel as a denser fuel suchj as Kerosene or Propane.
  4 KB (705 words) - 14:17, 19 July 2009
• Soil
  ...the entire decomposition process. Processed soil can be added to control reaction rate as well. The mixture should also be controlled to optimize the mixtur ...tent. Optimum processing, however, leaves from 10% to 20% of the original mass as processed compost. The time required is on the order of a few weeks for
  11 KB (1,766 words) - 04:02, 21 January 2009
• Solid core
  ...nuclear reactor is a reactor where the material that supports the fission reaction is in a solid state. This is the kind of reactor that is currently used on ...rockets are only about twice as efficient as chemical rockets in terms of mass fraction. Another factor that limits the performance of nuclear powered roc
  2 KB (293 words) - 04:02, 21 January 2009
• Sun
  ...of [[hydrogen]] and has enough [[gravity]] and heat to sustain a [[fusion reaction]] at its core. mass: 1.989e30 kg<br>
  421 bytes (62 words) - 04:02, 21 January 2009
• Mass Allocations for Mars Direct
  On page 92 and 93 of Zubrin's book, [[The Case For Mars]], he gives specific mass estimates for each component of his proposed [[Mars Direct]] Mission. Thes ! Component !! Mass
  5 KB (641 words) - 11:58, 20 March 2010