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74
Why is gold used in space technology to protection from heat radiation?
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56
Why was Venus rather than Mars targeted for the first interplanetary landings?
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50
Soyuz landing ground detection
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35
How can a 9-engine Falcon rocket be cheaper than single engine rockets?
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27
Can Voyager still use its thrusters to avoid hazards?
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21
What is the possibility of Voyager 1/2 colliding with matter (Asteroids or planetoids) present in space?
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20
Is there enough iron on the Moon to support industry?
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17
What is the mysterious “Ball of Mars”?
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17
How does propellant flow work in a nuclear thermal rocket?
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16
What fraction of a liquid rocket launching from Mars to return to Earth would be fuel?
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16
Does the ISS medical inventory include a sun-tan/sunscreen lotion/cream?
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15
How similar are Soyuz and Progress?
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15
Is it possible building an Space Shuttle in reinforced concrete?
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14
Can it be said that Venus is covered by an ocean rather than atmosphere?
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13
Why do artificial satellites need orbit correction, but natural ones don't?
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13
Why do the shapes of these two exhaust plumes from an Atlas V 411 look different?
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13
How can delta-v and aerobraking as shown in this chart be explained?
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12
Would reusable rockets render the idea of space elevators useless?
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12
What would determine the interior temperature of a large space station?
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12
Why are rocket engines operating above 100% often considered nominal?
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11
Titan rover survival challenges
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10
When approaching target planets/moons, how frequently do spacecrafts take photographs?
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10
Could steam be used as a efficient power source for a space craft?
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10
What do rockets eject?
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10
Has any work been done on alternatives to rolling element bearings in rocket turbopumps?
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8
Why does Soyuz use a single large parachute vs 3 on most American capsules?
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8
What does “tol” mean in a gear box?
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8
Why do Soyuz landings seem to be overshot?
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8
Is there an upper limit for the internal size of space stations?
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8
Is it possible to stand still in space?
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