Mark Adler's user avatar
Mark Adler's user avatar
Mark Adler's user avatar
Mark Adler
  • Member for 10 years, 7 months
  • Last seen more than a week ago
  • California
130 votes
Accepted

Why destroy Juno at the end of the mission?

95 votes
Accepted

Why A=2 and B=1 in the call signs for Spirit and Opportunity?

81 votes
Accepted

What are the towers around the SpaceX launch pad used for?

70 votes

Have we attempted to experimentally confirm gravitational time dilation?

65 votes

If the Apollo mandate were delivered today, would the mission vehicle(s) and profile be similar?

60 votes
Accepted

Why haven't more spacecraft/satellites been hit by debris?

57 votes
Accepted

Did the Mars rovers actually confirm the gravity of Mars?

56 votes
Accepted

Why not travel to Mars in 2 months?

55 votes

Why do most space probes survive for far longer than they were designed for?

46 votes
Accepted

How did the tangential thrusters for the 2014 LDSD test spin-up then spin-down so nicely?

45 votes
Accepted

Why should space probes have to orbit the Earth before being launched at other planets?

44 votes
Accepted

If I drop a feather from orbit, would it burn up or "hit" the ground?

44 votes
Accepted

Why is an airbag landing on the moon not viable?

42 votes
Accepted

How does a spacecraft know that it is in orbit?

41 votes
Accepted

Who took the Curiosity rover's self-portrait photo from the surface of Mars?

40 votes
Accepted

Puzzler - which spacecraft(s) incorporated real wood structural elements?

40 votes

Has any spacecraft ever been flown manually to orbit?

39 votes
Accepted

Why don't 3-parachute descent systems collide and collapse?

37 votes
Accepted

Requirements to orbit Pluto

36 votes

Could a helicopter fly on Mars?

35 votes

Flung debris in lunar landing

35 votes
Accepted

Why did Voyager 2's velocity drop far below escape velocity before the first gravity assist?

34 votes

Why was the Rosetta probe programmed to "auto shutoff" at the moment of hitting the surface?

31 votes
Accepted

How to check, if there is currently an increased solar activity?

31 votes

The Martian: Does it really take a supercomputer to calculate spaceflight maneuvers?

31 votes
Accepted

Why do some space telescopes require cooling (sometimes down to 3K)?

31 votes
Accepted

What is the purpose of the rotating dish antenna on the ISS

30 votes
Accepted

How does skipping off the atmosphere work?

29 votes

What Would Happen if We (Theoretically) Send a Drone With a Camera Inside a Black Hole?

29 votes
Accepted

How can Yuri Gagarin's Vostok 1 flight be considered to have been orbital, since he did not go all the way around Earth?

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