user avatar
user avatar
user avatar
pericynthion
  • Member for 8 years, 4 months
  • Last seen this week
  • Earth
104 votes

Couldn't I escape Earth's gravity traveling only 1 mph (0.45 m/s)?

43 votes
Accepted

Why cool engines with fuel as opposed to oxidizer?

35 votes
Accepted

Minimum Orbit Altitude

33 votes

Why aren't all satellite-carrying rockets launched from airplanes?

29 votes
Accepted

Why were there beeps punctuating the voice communications during missions such as Apollo?

28 votes
Accepted

Why haven't we sent seeds of life to other planets yet?

27 votes

Is it more challenging to put an airship in the Uranian than in the Venusian atmosphere?

27 votes

During the Space Shuttle Columbia Disaster of 2003, Why Did The Flight Director Say, "Lock the doors."?

26 votes
Accepted

Why didn't the Apollo program do an uncrewed landing/ascent rehearsal?

23 votes
Accepted

Could the Hubble HST be saved by docking with the ISS?

23 votes
Accepted

Lowest delta-v maneuver to reverse the direction of a satellite in LEO?

22 votes
Accepted

What is the deepest position in space we can get a GPS signal?

22 votes
Accepted

Why do gps satellites rotate over the Earth

21 votes
Accepted

Why isn't Pluto a circle on LORRI images?

19 votes
Accepted

Sputnik: What took so long?

16 votes
Accepted

What is the accuracy / uncertainty of Two Line Elements (TLEs)?

16 votes
Accepted

Were the aerodynamic control surfaces of the Space Shuttle used during ascent?

15 votes
Accepted

Are cubesats deployed with fully discharged batteries? Even those on Sherpa?

15 votes

What makes an antenna "high gain", and high gain as opposed to what alternative(s)?

14 votes
Accepted

Structural composition of shuttle liquid fuel tank wall

13 votes

Does atmospheric drag or reboosting maneouvers affect the integrity of microgravity experiments aboard ISS?

13 votes

How does SGP4 work?

12 votes
Accepted

How does the space station rotate, if at all?

12 votes
Accepted

What was the mascon "fix" used by Apollo 12?

12 votes
Accepted

Could a single crew member fly the Apollo LM?

12 votes
Accepted

How strong is the Sun's gravity at the distance of Jupiter's orbit?

11 votes
Accepted

Where were the complexes of the Soviet counterpart to the NASA DSN located?

11 votes
Accepted

Why would orbital fuel depots make sense?

10 votes

Why are the exhaust plumes exiting the nozzles of SpaceShip Two segmented along their length?

10 votes

What was the purpose of an Apollo 10 test?