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49 votes
3 answers
7k views

Why did Voyager 2 receive a gravitational slowdown (as opposed to a slingshot) at Neptune?

39 votes
1 answer
7k views

What was ejected from RocketLab's Electron launch vehicle at T+6:25 during stage two burn?

24 votes
2 answers
9k views

Why did SpaceX choose to use Hydrazine over newer "green" propellants for Dragon 2?

20 votes
5 answers
14k views

How much does it cost to fill an ion thuster with Xenon for a spacecraft propulsion system?

19 votes
2 answers
826 views

What was the outcome of the launch of ZUMA by SpaceX, to the best of the public's knowledge?

18 votes
1 answer
3k views

Why does NASA's Juno spacecraft only have a one year primary mission?

15 votes
1 answer
722 views

Through what process does MESSENGER undergo orbital decay?

10 votes
1 answer
438 views

Are there any Mars missions currently in the design phase which could take advantage of NASA's Low Density Supersonic Decelerator?

10 votes
2 answers
724 views

Through what mechanisms would SpaceX test and examine the returned CRS-5 first stage?

10 votes
1 answer
1k views

What engineering problems was Ares I facing at the time of its cancellation?

9 votes
3 answers
3k views

How will Dragon v2's solar panels be protected during launch on top of Falcon 9?

9 votes
4 answers
2k views

Why has Vanguard 1 not decayed significantly since its orbital injection in 1958?

8 votes
3 answers
2k views

What would one learn by borescoping a rocket engine after an aborted launch?

7 votes
2 answers
582 views

To what extent, if any, does the exterior paint color of a launch vehicle affect its propellant & vehicle thermal management?

5 votes
1 answer
655 views

How can I calculate the Characteristic Energy to Sun-Earth L1?

5 votes
0 answers
2k views

What "green" propellant powers Curie, the engine on RocketLab's payload kickstage?

4 votes
2 answers
994 views

Why has no TLE been published for the DSCOVR satellite and the Falcon 9 R/B?

3 votes
1 answer
647 views

Will, or when will, Mars Global Surveyor decay from orbit?

3 votes
1 answer
571 views

What satellites were launched into a polar orbit from Cape Canaveral in the 1950s and 1960s?

2 votes
1 answer
1k views

How many Draco engines does Dragon 2/Crew Dragon possess?