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An Apollo 17 recovery image of the top of the CM, ap17-S72-55888 from ALSJ. What is the...
Asked on 12/16/2021
1 answerIon thrusters need a lot of energy. But I don't understand why. So, one thing I understand is that it takes a lot of energy to achieve a high exhaust...
Asked on 12/11/2021
6 answerI understand that an ion-thruster will continuously charge its spacecraft with a charge opposite of the one of the ions it thrusts. Over a long journey this charge would be...
Asked on 12/09/2021 by Diomidis Spinellis
2 answerThis answer to Neutralization of ions in the ion thruster quotes the introduction to Wikipedia's Ion thruster:Temporarily stored electrons are finally reinjected by a neutralizer in...
Asked on 12/07/2021
1 answerI have a question about neutralizing the ion thruster, why simply does not put a positive potential on the satellite to prevent the emitted ions from returning to the satellite?...
Asked on 12/04/2021
2 answerThe worst obstacle and the primary roadblock to using superconductors on Earth is the ambient temperature which necessitates a coolant like LN2 or even liquid Helium (and a lot of...
Asked on 11/30/2021
1 answerElon Musk has made very clear that his goal is a colony on Mars. That doesn't seem ideal to me at all. Certainly some people will be happy to live...
Asked on 11/27/2021 by Gene McCulley
10 answerPretty simple question here. I'm calculating time of flight between two true anomalies by converting those true anomalies to mean anomalies and using the following equation: $Delta t...
Asked on 11/27/2021 by D. Hodge
1 answerIn 2016 a large ice deposit has been found within the Utopia Planitia region on Mars by the SHARAD instrument on board of the Mars Reconnaissance Orbiter....
Asked on 11/25/2021
3 answerSpaceX recently tried to recover fairings from falcon 9, which landed intact in the ocean. How come do these not burn up during reentry?...
Asked on 11/25/2021 by Kamil Aliyev
3 answerGet help from others!
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