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62 votes
Accepted

Was the NOAA-N Prime satellite really dropped on the floor?

34 votes

Why are spacecraft computers obsolete at launch?

23 votes
Accepted

What problems led to the use of the Sky Crane system used by Curiosity?

20 votes
Accepted

Do any (LEO) satellites move east-to-west?

14 votes
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Does long-term residence on the ISS affect eyesight?

14 votes
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What caused Curiosity's electrical trouble?

14 votes
Accepted

Why is the SOI of Jupiter less than that of Neptune?

13 votes
Accepted

Why did ISRO require additional tracking ships in the South Pacific for its MOM mission?

13 votes
Accepted

Was quarantine continued after Apollo 11?

13 votes
Accepted

Would wearing heavy clothing be enough to solve the health effects of reduced gravity on other planets?

12 votes
Accepted

How could we observe the Oort cloud, if it exists?

12 votes

Mining in microgravity: are there sound studies?

12 votes
Accepted

What are the differences between the Falcon 9 (1.0) and the Falcon 9 (1.1 or F9R)?

12 votes
Accepted

Why did the HiRISE camera team choose the wavelengths they did?

12 votes
Accepted

Has any CubeSat flown with an active propulsion system?

11 votes
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Combatting noise in spacecraft

11 votes

is it possible to use mechanical pencil instead of space pen in ISS?

10 votes

Techniques for digital superluminal communication

9 votes
Accepted

Is there any ongoing research in nuclear pulse propulsion?

9 votes

Day versus night launches

9 votes

What was Apollo 11's reentry speed at parachute deployment?

9 votes

How are multiple launches handled?

8 votes

How do space missions preserve their batteries for so long?

8 votes

What is the purpose of having a countdown during a rocket launch?

7 votes
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Have there been any recent lunar rovers?

7 votes
Accepted

Alternatives to centripetal force and constant acceleration to simulate Earth-like gravity

6 votes

What maximum speeds can be expected from meteorites?

6 votes
Accepted

Changes made to ISRO GSLV-D5's CUS and FBTP since GSLV-D3's LH2/LOX CUS failure to sustain ignition?

6 votes
Accepted

What are the main problems with magneto plasma dynamic (MPD) thrusters?

5 votes
Accepted

To what celestial bodies are GRAIL-like missions planned?