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SF.'s user avatar
SF.
  • Member for 10 years, 4 months
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119 votes

Can a human land on Deimos using pressurized deodorant cans?

68 votes
Accepted

Why don't we know exactly where the Chinese rocket will fall?

67 votes
Accepted

Why do ISS crew members often cross their arms?

64 votes

Why aren't the 'bedrooms' aboard the ISS also the escape pods?

64 votes
Accepted

Did the Challenger SRBs fail due to design for reuse?

55 votes
Accepted

Does the ISS have a watch system with at least one person monitoring at all times

51 votes
Accepted

Do astronauts live longer than earthlings?

50 votes
Accepted

How does a space probe maintain its trajectory while passing through the extreme gravitational field of the gas giants of our solar system?

46 votes

Why can't spaceships just accelerate to create gravity?

41 votes

If the Earth spun clockwise, how would that affect Space Exploration?

40 votes

Why don't we put an EmDrive in space?

38 votes

Why are the bottom of most stages flat?

35 votes
Accepted

Wheels vs. tracks for rovers

34 votes
Accepted

Would this chair support astronaut during launch in Crew Dragon

34 votes
Accepted

Could a helicopter fly on Mars?

32 votes
Accepted

Could a Human reach escape velocity by jumping from the surface of Ceres (a dwarf planet)?

30 votes
Accepted

Performance of a pumpless liquid rocket engine

30 votes
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What is the highest possible altitude of a sub-orbital flight?

30 votes
Accepted

The principle behind regenerative cooling?

29 votes
Accepted

Where can I download the Soyuz Crew Operations Manual?

29 votes
Accepted

Why don't rockets use propane?

27 votes

How fast is fuel escaping a rocket for it to reach the escape velocity 11 km/s?

27 votes

Could a Boring Company Excavation Tool be used to create a large circular chamber inside an asteroid?

27 votes
Accepted

Why not build rockets out of composite materials?

26 votes
Accepted

Why is it not concerning from a cost perspective to have so many engines on Starship?

26 votes
Accepted

Why do many RTGs have finned heatsinks, when this is considered bad for radiation heat transfer?

26 votes
Accepted

When will we have the technology to directly observe an exoplanet with significant clarity?

25 votes

Space train concept picking up/releasing cargo

25 votes

What were the most inaccurate or accurate things in "The Martian"?

25 votes
Accepted

In deep space missions, how much of the journey is pre-programmed and how much is "direct" control?

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