Jack's user avatar
Jack's user avatar
Jack's user avatar
Jack
  • Member for 7 years, 7 months
  • Last seen more than a month ago
90 votes
Accepted

Why was it necessary to program InSight with an ability to land in dust storms?

82 votes
Accepted

Why are so many space telescopes placed in LEO instead of at Lagrange Points? And why do we hear about Hubble more than any Langrange-orbit telescope?

66 votes
Accepted

What is the farthest artificial satellite in orbit in our solar system?

45 votes

What holds SpaceX’s rocket in place in this launch?

28 votes
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Could we see someone walking on Mars from Earth?

27 votes
Accepted

What is the purpose of the satellite that China is putting in lunar orbit?

25 votes
Accepted

Why does the 2nd stage of Falcon 9 need compressed He tanks?

25 votes
Accepted

Why is Voyager/Pioneer so slow compared to Parker Solar Probe?

25 votes
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Does anyone recognize these rockets, and their location?

24 votes

Why aren't payloads their own fairings?

21 votes
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How an americium-241 RTG would differ from one using plutonium-238?

20 votes
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Has the Earth's red atmosphere rim ever been photographed?

19 votes
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What would it cost to bring a 1 gram payload to the CMBR rest frame (i.e. Δv 368 km/s ?)

19 votes
Accepted

Can the Right Ascension and Argument of Perigee of a spacecraft's orbit keep varying by themselves with time?

16 votes

"Pillars of Baikonur" What is the purpose of the hundreds of short, white posts near the Baikonur Cosmodrome launch pad?

14 votes
Accepted

Rock flipping operation

14 votes
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Will an array of multiple ion engines still be more efficient than a single chemical engine?

12 votes
Accepted

Is it possible to change to different orbit inclinations with a simple push?

11 votes
Accepted

Why is the northeastern region of Syrtis Major Planum a selected landing site for the Mars 2020 mission?

11 votes
Accepted

What is the minimal TWR of Falcon 9 booster right before touchdown?

11 votes
Accepted

Debris breaking away from Electron rocket

10 votes

A spacecraft leaves Earth exactly with escape velocity V2 - what trajectory it will have in Solar System?

10 votes
Accepted

Elliptical orbits transformed to "equivalent" circular orbit

10 votes

Is the ESA Roscosmos ExoMars Orbiter capable of detecting the NASA landers and rovers on the surface of Mars?

10 votes
Accepted

How would a Jupiter flyby have helped to get to the Sun? Why was it later ruled out?

10 votes

Will or could the Parker Solar Probe do science at Venus?

9 votes
Accepted

How far will the debris cloud from Hayabusa-2's touch-and-go sample recovery travel around Ryugu? Will any have escaped to heliocentric orbit?

9 votes
Accepted

What is this huge, red, blinking light structure on Earth seen from the ISS in this video?

9 votes
Accepted

How does ROSA unroll? (Roll Out Solar Array)

9 votes
Accepted

What is the delta-V equivalent to cross the Kármán line in vertical (suborbital) flight?