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Active 2 Bountied Hot Week Month
6 votes
2 answers
145 views

Helium balloon as a rocket

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The Rocket fan
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6 votes
3 answers
2k views

Could oxyhydrogen (2:1 H₂/O₂ mix) be used as a rocket fuel?

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Loren Pechtel
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6 votes
1 answer
314 views
+50

How much does JWST actually weigh?

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Fredrick Germann
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3 votes
3 answers
330 views

How could 99942 Apophis, in 2029, be captured and brought into a low Earth orbit?

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Ryan C
  • 5,142
12 votes
3 answers
3k views

How are the Mars Rovers maintained?

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Organic Marble
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4 votes
2 answers
72 views

Is crater counting accurate for relative dating between celestial bodies?

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olamarre
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27 votes
4 answers
2k views

What happens to defunct lunar and Mars rovers? What technological barriers prevent humanity from creating a perpetual rover?

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Deko Revinio
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3 votes
2 answers
641 views

Is there any chance Mars-3's Prop-M rover deployed automatically and "roved"?

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Deko Revinio
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1 vote
2 answers
255 views

Are nozzle plugs taken out before launch or are they ejected upon ignition?

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Organic Marble
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5 votes
1 answer
125 views

Can something like SpinLaunch actually work?

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Slarty
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2 votes
1 answer
146 views

When and when not to use the SDLS protocol?

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CommunityBot
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7 votes
2 answers
577 views

Is it more expensive to send a chemical rocket from surface of Earth to an orbit or from this orbit to Mars?

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Ethan Krauss
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0 votes
0 answers
35 views

After one year exploring Jezero's crater floor, (why) hasn't there been any investigation into the presence of all the trace elements with PIXL?

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Cornelis
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3 votes
0 answers
29 views

Low-thrust maneuver validation in GMAT

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Fede
  • 31
5 votes
2 answers
289 views

Does the Moon's atmosphere have any amount of human-provided xenon?

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Loren Pechtel
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4 votes
1 answer
192 views

Could a laser ablation-based propulsion system really accelerate an object to 0.001 c?

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user47149
  • 506
10 votes
1 answer
13k views

If Mars had denser atmosphere, how warm would it be?

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user47149
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2 votes
1 answer
65 views

Are there any studies on Mars-Earth ballistic cyclers taking Mars-gravity assist into account?

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BrendanLuke15
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6 votes
1 answer
2k views

Could we achieve aerodynamic and aerostatic lift on the Moon if it had an atmosphere of xenon?

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user47149
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6 votes
2 answers
295 views

Is the Gateway's halo orbit bound to Earth? Would the Gateway remain in Earth orbit if the Moon disappeared?

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user47149
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0 votes
2 answers
131 views

Can a human base jump to earth from a satellite? [duplicate]

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bukwyrm
  • 291
9 votes
2 answers
412 views

How does Spinlaunch manage the counterweight right after launch?

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qq jkztd
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17 votes
5 answers
11k views

Why doesn’t NASA build its rockets using graphene?

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ikrase
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1 vote
0 answers
95 views
+200

Did Chang'e-3 and/or Yutu report getting hit by the Earth's magnetotail?

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uhoh
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4 votes
1 answer
153 views

Do monopropellants have a characteristic length?

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ecfedele
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9 votes
4 answers
5k views

Can a military satellite be used to spy on any place on Earth undetected? [closed]

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BradV
  • 1,526
3 votes
4 answers
1k views

near space vacuum balloon

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The Rocket fan
  • 242
23 votes
10 answers
9k views

Can you really use Arduino for a small spacecraft?

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PearsonArtPhoto♦
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7 votes
1 answer
217 views

Venus gravity assist (and aerobraking) - How much delta-V can it add?

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BrendanLuke15
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15 votes
2 answers
31k views

Calculating solar system escape and and sun-dive delta V from lower Earth orbit

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RockPaperLz- Mask it or Casket
  • 203
8 votes
3 answers
3k views

Why are there no video transmissions from the Moon and Mars?

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RockPaperLz- Mask it or Casket
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6 votes
1 answer
154 views

Can we use magnets to land a spaceship (Starship)?

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Camille Goudeseune
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16 votes
4 answers
12k views

How many plants would be needed to produce oxygen enough for 20 humans?

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user47149
  • 506
18 votes
9 answers
5k views

Would it be practical to catch a rocket's exhaust to reuse it as fuel?

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Fredrick Germann
  • 51
3 votes
2 answers
251 views

Could we get free O₂ on Mars?

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user47149
  • 506
4 votes
1 answer
324 views

How to find the hyperbolic angle given the mean anomaly?

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Chris
  • 43
3 votes
1 answer
226 views

What's this inside the RD-0120?

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fasterthanlight
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3 votes
0 answers
38 views

Is there a significant reason why pintle injectors are only used in single configuration?

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ecfedele
  • 418
35 votes
3 answers
8k views

What is the primary reason for SpaceX motion to have astronauts board Dragon before fueling up the rocket?

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user47149
  • 506
6 votes
1 answer
484 views

How much of the world's xenon has been used in spaceflight altogether? Is it a lot? Did it cost a lot?

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user47149
  • 506
3 votes
1 answer
212 views

Determining the spacecraft position vector with respect to ICRF frame for Venus flyby

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BrendanLuke15
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3 votes
1 answer
86 views

What is the relationship between the periapsis altitude and the change in velocity in a gravity assist?

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BrendanLuke15
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11 votes
1 answer
446 views

Could SpaceX's Starship's landing and restart process work on Titan?

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BrendanLuke15
  • 7,992
5 votes
2 answers
278 views

Where can I find an up-to-date report on the Hubble Telescope's orbital history and current altitude?

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BrendanLuke15
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2 votes
0 answers
53 views

Which is the primary spacecraft in a conjunction?

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Fred
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3 votes
0 answers
143 views

Why "quiet cruise" of a spacecraft would cost NASA 30 mln $ a year?

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Heopps
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24 votes
2 answers
8k views

If an astronaut needs to go to the toilet during launch, what can they do and what do they need to do?

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user47149
  • 506
4 votes
1 answer
498 views

Does engine purging cause dry run of turbo pump in a liquid rocket engine? If it occurs, what is the implication?

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