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24 votes

Why did Apollo 13 not use the electronics waste heat to raise the Lunar Module cabin temperature?

apollo-13 asked Apr 16, 2020 at 11:12
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21 votes

Which astronauts or cosmonauts were injured by a hard landing?

landing astronauts medical capsule asked Oct 3, 2020 at 20:44
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19 votes

What was the reason to use different fuel for the Apollo Service Module propulsion system and reaction control system?

apollo-program liquid-fuel hypergolics asked May 27, 2018 at 11:27
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19 votes

Usage of Apollo Lunar Surface Hasselblad Camera with 500 mm lens?

apollo-program photography lunar asked Sep 23, 2018 at 20:12
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16 votes

Are there photos of the Apollo LM showing disturbed lunar soil resulting from descent engine exhaust?

apollo-program lunar-landing lunar-module asked Sep 2, 2019 at 15:49
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15 votes

Why did they use uprighting bags in different sizes for the Apollo CM?

recovery apollo-12 apollo-17 asked Jul 29, 2020 at 8:58
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14 votes

Do the ISS docking ports require maintenance?

iss docking-port asked May 31, 2020 at 19:04
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14 votes

Parachute material used for the Venera probes to survive 500 °C

venus lander soviet-union venera asked Jun 11, 2021 at 4:23
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13 votes

Did they manufacture six space suits for Apollo astronaut James A. Lovell?

spacesuits apollo-13 apollo-8 asked Mar 28, 2020 at 19:27
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13 votes

Were these Apollo 14 and 15 recovery images taken (by a Navy frogman) using an underwater camera?

apollo-program photography recovery apollo-15 apollo-14 asked Jul 20, 2020 at 13:43
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Top Answers
148
Could we breathe an atmosphere that is not nitrogen based?
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80
What if Apollo Lunar Rover failed on the Moon?
space.stackexchange.com

64
Is Jupiter bright enough to be seen in color by the naked eye from Jupiter orbit?
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62
Why did Saturn V not head straight to the moon?
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62
Why is there a large wooden ball on Mariner 3's magnetometer?
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56
If an astronaut threw a cup of coffee into space, would it freeze, or boil off into gas?
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53
Are there any known reasons why there are no spaceports in the European Union?
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53
Why isn't it possible to build a space elevator at the north pole?
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51
Why are all trajectories in space a conic sections?
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47
How did the X-15 control attitude above the Kármán line?
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46
First call to the moon 1969
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42
Why were contact sensors put on three of the Lunar Module's four legs? Did they ever bend and stick out sideways?
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41
Was the Apollo 13 CO2 problem a matter of capacity, or of rate?
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40
Why did the Apollo capsule have seats if the astronauts never were sitting in it?
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38
What are the Advantages of having a Double-pane Space Helmet?
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38
How did astronauts frame photos without a viewfinder?
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35
Could the lunar module have moved to a different spot?
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35
Why did Cassini require so much more power than other probes?
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34
Could Mars Rovers be lighter or faster if they didn't have to be tested on Earth?
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33
Why would sub-cooled LOX tanks need to "topped-off" until the last minute or so?
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33
How did the USSR track Gagarin's Vostok-1 orbital flight? Was tracking capability an issue in the choice of orbit?
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32
Did Wernher von Braun really have the "Saturn V painted as the V2"?
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31
Was a one way trip to the moon considered by the crew of Apollo 13?
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30
Why is the Apollo LEM ladder so far from the ground?
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30
Why exactly does Curiosity's RTG make more electricity on cold days?
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30
Why would spacecraft docking to the ISS have a different atmospheric pressure?
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30
Could sheets of stacked graphene be used as part of a heat shield, since its melting point is 3000k to 5000 K
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30
Is it possible to see mercury transit "clearly" by the naked eye?
astronomy.stackexchange.com

30
What does "double vacuum pressure" mean in space-suit testing?
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30
Why all the 'dust' on liftoff?
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