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Top Questions

16 votes
3 answers
5k views

Is it true that engines built in Russia are still used to launch American spacecraft?

10 votes
6 answers
3k views

Starlink Satellite Orbits

11 votes
4 answers
3k views

How do satellites operate below their operating temperature?

11 votes
2 answers
2k views

Why do cryogenic fuels want an extra pressure tank?

5 votes
5 answers
3k views

Is a dome really the most efficient way to contain gas in a vacuum?

7 votes
1 answer
2k views

What is the maximum number of times a liquid rocket engine has detonated/ exploded during development?

10 votes
1 answer
2k views

How exactly does the JWST (James Webb Space Telescope) "see" light from so far away? [closed]

9 votes
2 answers
4k views

Can Maglev trains ever reach escape velocity?

5 votes
2 answers
1k views

What's the difference between cryogenic and Liquid propellant?

15 votes
2 answers
2k views

Eye Spy: Where are the other two (of six) vehicles docked to the ISS in this Maxar image (& what are they?)

10 votes
2 answers
1k views

Do we know how the SpaceX Starship stack handles engine shutdowns?

11 votes
1 answer
1k views

What is the goal of the message “astronaut use only” written on one Hubble's module?

5 votes
2 answers
1k views

Is the Rocket Lab launch scheduled for May 31 only launching a tiny cubesat?

12 votes
1 answer
940 views

Why does the proposed Lunar Crater Radio Telescope suggest an optimal latitude of 20 degrees North?

5 votes
2 answers
903 views

Are Hybrid Rocket Motors still in use?

6 votes
2 answers
294 views

Hubble gyro manufacturer

3 votes
2 answers
739 views

Moons rotation about its own axis [closed]

5 votes
3 answers
1k views

Permanent living on Maglev train on the Moon as a colony

2 votes
2 answers
655 views

Is the angular orbital velocity of a satellite in a circular orbit constant?

4 votes
1 answer
217 views

What proportion of the total fuel load in a Saturn V was used to drive the pumps?

5 votes
2 answers
185 views

Why radiation hardened processors are designed to withstand so large total ionizing doses?

5 votes
1 answer
303 views

After a spacecraft departing from the ISS has performed its deorbit burn, what is the altitude at the perigee of its elliptical orbit typically?

3 votes
2 answers
191 views

How is Starship longitudinally stable during reentry?

4 votes
1 answer
214 views

What is the advantage of the "Mechazilla arms" over fitting the Super Heavy booster with landing struts?

5 votes
1 answer
163 views

How does a liquid rocket engine prevent the combustion from going back in? [duplicate]

5 votes
2 answers
161 views

Where does this formula for the argument of periapsis come from?

3 votes
1 answer
199 views

How was it determined that 1977 was best time to launch voyagers for "grand tour"

4 votes
3 answers
181 views

Has IFT-4 demonstrated that Starship is ready to enter service?

2 votes
2 answers
180 views

What's the purple glow in SpaceX Starship's IFT-4 re-entry video?

6 votes
1 answer
75 views

Did Mariner 9 have a magnetometer?

4 votes
1 answer
201 views

Is there any film of Saturn V Stage 1 falling to the ocean?

-2 votes
1 answer
137 views

Can robots take the jobs of humans in space? [closed]

4 votes
1 answer
215 views

Would that asteroid transport be possible?

2 votes
1 answer
153 views

Could Phobos or Deimos be a good target for mining?

2 votes
1 answer
211 views

Could the Dream Chaser be launched to the ISS with a Falcon 9 rocket?

1 vote
1 answer
170 views

Why should nozzles be perfectly expanded?

0 votes
2 answers
117 views

If we could mine asteroids, how would we get the stuff mined from said asteroid back to earth?

1 vote
2 answers
187 views

How precise does Super Heavy's tower landing have to be?

1 vote
1 answer
172 views

What does w.r.t. mean? I've found it in the summary of jup365.bsp [closed]

3 votes
1 answer
123 views

How well does a sea-level engine operating in a vacuum perform compared to a vacuum-optimized engine operating in a vacuum?

4 votes
1 answer
110 views

Did the ISS CREAM experiment actually get relocated?

6 votes
0 answers
121 views

Has the continued monitoring of the Voyagers probes been in danger of being discontinued, and if so, how many times?

1 vote
1 answer
93 views

Apollo Third Stage SLA Separation design change?

7 votes
0 answers
105 views

Does Chang'e 6 try to avoid sampling contaminated soil?

5 votes
0 answers
96 views

Which LEO satellites have publicly available accurate position information? [duplicate]

1 vote
0 answers
118 views

Any ideas?: Calculating wet-mass and burn altitude for a Mars landing, using a Python simulation

-3 votes
0 answers
105 views

Too many questions about moon landing [closed]

2 votes
0 answers
92 views

Rocket Launch Azimuth Calculation


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