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Erik's user avatar
Erik's user avatar
Erik's user avatar
Erik
  • Member for 10 years, 10 months
  • Last seen more than a month ago
41 votes

Did the Space Shuttle have "military uses"?

37 votes
Accepted

Why didn't the Space Shuttle have a launch escape system?

30 votes
Accepted

How did astronauts traverse from module to module in the Apollo craft?

29 votes

What are the choices today for orbital mechanics simulation software?

26 votes
Accepted

Is converting moon dust into oxygen a viable option for sustainability?

26 votes
Accepted

How long did it take, at a minimum, to prep a shuttle for launch after it landed?

25 votes

What is the ideal shape for a rocket?

22 votes

What specifically makes launching objects from Earth into space expensive?

16 votes
Accepted

What's inside NASA N911 Shuttle Carrier Aircraft (SCA 747)?

15 votes

Why was Dragon sent to the isolation room?

15 votes

What time zone is used on ISS to define a day?

15 votes

Could a ship take off from Earth using ion thrusters?

14 votes
Accepted

At what travel distances are ion engines faster and more efficient than conventional fuel engines?

14 votes
Accepted

Is artificial gravity feasible in manned long-term space exploration?

14 votes
Accepted

Is ISP all there is to engine efficiency?

13 votes
Accepted

Would tethering to a large mass be an efficient way to change velocity?

13 votes

Use of steerable parachutes for re-entry

12 votes
Accepted

Is it possible to take images of extrasolar planets?

12 votes
Accepted

Is there any research or recommendations for a diet in microgravity?

12 votes

Lowest ISS microgravity

11 votes

Does the Dawn spacecraft have the potential for an extended mission?

10 votes
Accepted

In a cryogenic fuel rocket, at what pressure is the fuel injected into the engine?

10 votes

What's the maximum amount of time the ISS can go between resupply runs?

10 votes

Could an Apollo astronaut have put their foot through the hull of the LEM?

10 votes
Accepted

Could the Apollo 13 crew have survived the CO2 issue using their spacesuits

10 votes

How will SpaceX tie down a landed stage on the ASDS barge after landing?

10 votes

What CAD system do the ISS designers use?

9 votes

Mathematics used for SpaceX first stage re-entry burn guidance?

9 votes
Accepted

Why are low earth orbit satellites not visible from the same place all the time?

9 votes
Accepted

Besides Luna, what celestial bodies exhibit lumpy gravity?